Possible for rad/elec to be greater than rad/rad?
I have played rad/elec to lvl 40. Mainly because i dislike playing same ol same ol toons.
However, there are some significant advantages:
Elec sapping also means elec end giving (i.e. you gain end from your firing), meaning average end cost of your attacks is significantly lower than other secondaries... If you want to play a blasting defender, elec is good choice.
END sapping of elec is in essence a good combo with EMP and -end regen effects of Rad... BUT bear in mind end sapping has had a huge kick in the jubblies from the end boost of recent patch, and i do mean HUGE. Apparantly this is due for rectification at some later date (Castle said so! 
)
AoE of ball lightning and short circuit probably (just) outshines irradiate and neutron bomb overall, but there aint much in it.
Personally, by the time I have debuffed defence from Rad primary, there is little more to be gained from the -def effect of Rad secondary, as Im hitting everything 90% of time anyway, as are rest of team. You may wish to consider this as it actually IMHO means you arent getting a whole hillabeans out of rad secondary as a rad/rad.
Voltaic Sentinel aint that good, it aint that bad. Bear in mind it isnt a pet, just a white blob that you cant target and fires out bolts roughly equivilent to your lvl 1 power.
Takes yer pick. I have preffered rad/elec as allows me to be a semi - blaster (and given you target very debuffed foes, it is a modest but significant damage effect) for end reasons. Prior to the END buff patch recently, it was very effective, now its a bit equivical (but more attractive than further DEF debuffs of rad secondary IMHO), but this may be re-addressed by devs
I find Rad/Sonic to be pretty potent. All that stacking -res works a treat
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The big bonus of Rad/Rad is cosmic burst, I can see many pro's of Elec as well though. Rad/Rad, Rad/Sonic, Rad/Elec and Rad/Dark all seem like they could be good to me. I dont think there's much that would be weak with the Rad set as its fairly even on its debuffs (as in if its there, Rad will debuff it) so you dont need to pick anything up with your secondry. Only thing I wouldn't want to play myself is Rad/En, knockback pushes foes out of your anchors, out of Chocking Cloud and could well get you killed. I still dont think it would be an impossible build, but its not a challange I'd set myself
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I love the rad/rad combo, but I was wondering if there were any overlooked, potent offender combinations out there. I thought of rad/elec, but I don't know if that's so powerful with lack of endurance drain. It seems to have more damage, and volatic sentinel seems useable on an offender. Also short circuit maybe pretty potent if fired before EMP. Am I right in thinking ball lightning has a far superioir animation time to neutron bomb? Anyone know if this could work? If you want to just persuade me back to rad/rad, that's fine to