In PvE, both are really nice. Psi is quite an "either or" primary, as enemies are usually _very_ resistant to it, or not resistant to it at all. Psi has more viable single target attacks than any other set, so it's really more of a boss killer of a set. Also the secondary effect is more defensive than offensive, as -recharge makes the enemy attack less.
Sonic is a bit more focused on the AoE side with more crowd control capabilities. Sonic's base damage types are pretty much resisted by everyone on some level, but the secondary effect that's quite focused on bringing down the enemy ASAP regardless of this (-res(all)).
On PvP side, Psi is the Flavor of the Month, but that might be partly because it's new. But most likely because Psionic damage is not very well resisted in PvP.
The secondary pretty much depends what you want to do with the character. Energy's Power Boost doesn't affect either -Resistance or -Recharge, so thinking from that vantage point, it's not that clear a choice as it might be for some other primaries. On the other hand, Psi, bring the longest range attack primary, benefits nicely from Boost Range. And Sonic, being quite short ranged, does so as well. Electricity and Energy are for either of the sets pretty much the best option for a single target melee secondary. Fire rules all for AoE melee, and as such, could either complement Psi with the ST focusing (and Psy Tornado, being KU, could give you a nice opening to rush in and start dealing PBAoE), or benefit greatly from Sonic's AoE -Resistance powers. Devices can work really well with either, but it on the other hand a set that requires quite unique thinking and quite often defines how you play your primary. Ice secondary is based quite heavily on soft control, one that nicely stacks with psi, but on the other hand keeps mobs in neat groups that can be dealt with AoEs. And finally, Mental Manipulation, that offers nice variety of powers, again, working for either quite well.
So, to summarize: Depends what you like.
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
Thx alot for the help Alvan!!!
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Psi, bring the longest range attack primary
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Actually the range of psi attacks was reduced to 80 feet like most blaster primary attacks to bring it in line with them. 
- @DSorrow - alts on Union and Freedom mostly -
Currently playing as Castigation on Freedom
My Katana/Inv Guide
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either. -Einstein
aww 
well, it's not like I've had time to play the damn thing over level 6 
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
I havent even touched the psychic primary for blasters yet... But I do read patch notes 
- @DSorrow - alts on Union and Freedom mostly -
Currently playing as Castigation on Freedom
My Katana/Inv Guide
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either. -Einstein
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I havent even touched the psychic primary for blasters yet... But I do read patch notes
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I don't really like the characters in those, and the plots are generally sub-par. However, the twists in them are sometimes quite surprising, so I do understand why one would be a reader...
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
- @DSorrow - alts on Union and Freedom mostly -
Currently playing as Castigation on Freedom
My Katana/Inv Guide
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either. -Einstein
[ QUOTE ]
I havent even touched the psychic primary for blasters yet... But I do read patch notes
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no erf/babl blastaz
What in PvP Resits Psi?
I'm thinking about a new Blaster and was glad to find this post as Psi+Son were my two main choices... thinking about /Dev or /Elec or /Nrg ~ any advice for PvP only, not interested in PvE
Looking for something fun and something that will cause people to say things like... "[censored] that hurt run run ! "
=D
Carlsberg don't do Farming,
But if they did..........
If you want to PvP on a blaster you ready need /EM. Boost range is what makes blasters super uber. PowerBoost is also nice, but imo im not its as important as boost range on psi/ as theres not much to boost. /EM also has Total Focus which does silly damage but is rubbish for PvP as its too slow, it also has Bone Smasher which does very nice damage and isnt to bad animation time wise.
Although other seconadries are capable in PvP /EM is easily the best and the set of choice for serious PvPers.
em.... was hoping on a decision for primary... psi vs sound??
sorry Nicky x
Carlsberg don't do Farming,
But if they did..........
Well if you want to be really uber go for psi. Sonic is nice, but IMHO batter for taking down bigger targets beacuse it has the -res. PvP is about spike damage and IMO psi would be better for that it also has a better range than sonic, and range is very important in PvP. Also sonic is more havily resisted than psi.
Hey i was just wondering what would fair the best in psycic blast vs Sonic attack and what secondery would compliment them the best in pve and pvp.
((was thinking of mental or nrg secondery))