Both can be brill in PvP. Dark/Psychic is often stated as great because of the potential for great damage, control, and slows. Storm/Psychic will create utter chaos. Dark/Sonic, awesome res debuffs therefore great damage with a touch of control. Storm/Sonic... pretty good knockback control, again, brilliant for creating chaos.
They'll all be good in both PvE and PvP.
If you're used to blaster damage, I think I'd be tempted to give Dark/Sonic a whirl. I personally love psychics, because of the large amount of single-target control available.
DON'T eat muffins while I'm developing you.
Pants! Turkey Magnates! A man in a box! Rogue AI! Come one, come all, to arc ID 10107 - It's [i]'Not as long as some other arcs'[/i]!
hmm both are so tempting i doint know what todo i have a dark mm and its awsome altho i also have a storm troler wich i also adore and i realy doint know with sonic and psonic couse i doint realy know them
wait a minute my mm is at lvl 35 so i doint have dark servent yet but now i see it only lasts 11 seconds on mids XD and recharge is like 230 seconds tahts pretty useles [censored] is taht tru i mean comon that realy sucks
whiles ye can get perma storm cloud!
Ah... well...
Sonic is mostly very short ranged; you'll be in close. Some of the attacks do -res, so your next attack will do that little bit more damage. It has a cone sleep and a single target disorient by way of control; in PvP the sleep will be good for bubblers, and the disorient for anyone with Acrobatics. It also has a cone knockback power, if you're into that sort of thing. The attacks are fairly widely resisted, being largely a mix of smashing and energy damage.
Psi, by way of comparison, is very long-ranged. The snipe is the joint longest unenhanced range in the game (along with Moonbeam, iirc), and the two powerful 'bread-and-butter' attacks, Will Domination and Telekinesis, also have a very long range on them. All of the attacks slow the target's recharge speed a bit. There's a lot of control in the set - a single-target immobilise, knockback, sleep and disorient, and an AoE knockup power. The damage is less resisted, being mostly pure psychic, although one attack has a smashing component to it too. It lacks an aim power, however, so you won't have a mini-buildup which is so useful in PvP; I consider this easily outweighed by the generally higher damage output and lower res/def to the set.
The nukes on the two sets are more or less identical - both PBAoE with a stun.
ps. Mid's is lying to you. Dark Servant lives longer than its own recharge, it is to all intents and purposes perma.
DON'T eat muffins while I'm developing you.
Pants! Turkey Magnates! A man in a box! Rogue AI! Come one, come all, to arc ID 10107 - It's [i]'Not as long as some other arcs'[/i]!
ah ok kwl ty!
think im gonne make a dark/psonic!when i get my 41 to 50 one day. .. .
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think im gonne make a dark/psonic!when i get my 41 to 50 one day. .. .
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Dark/psonic?!?!? Bit of a compromise there? 
Why? 
Sup all,My blaster is almost at lvl 50 and i was thinking to make a defender next For my primery i was thinking ether dark or storm so what would be the best of those to as for the secondery i was thinking psy or sonic ((this char will be pve up until lvl 40 from there on pvp and pve))
ps: I LOVE PVP