Read the forums and other threads afore you go begging in the Brute, Blaster, and Corruptor forums for how and what to play.
Any AT and powerset combo in the game can solo at +0x1. Any AT and Powerset in the game can be useful on a team. It depends on what you find fun. Hence why this is a game, not a competition, nor a job.
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If you're determined to "softcap or bust", I'd pick one of the easier secondaries to do that with. Those that don't provide significant +defense powers are harder to softcap without making significant sacrifices in other areas of the build. Enough that I'm personally not willing to do it. The one exception is if you're just looking to softcap smashing/lethal, in which case an epic/patron shield can get you a good part of the way.
The easiest secondary to softcap is /Traps. It's also a fairly potent secondary, though the playstyle is not for everyone.
I like Traps and Time, but for purely solo play, I would keep both as defender. For corruptor I'd do TIme and use the -to-hit to pad the defense numbers.
For Defenders
Traps/ with Dark, Ice, or Fire
Time/ with Fire, DP, Ice, or Rad
For Corruptors
Fire/Rad
Fire/Dark
Fire/Storm
Ice/Cold
Fire/Kin
And many others. It's not the AT, nor even the primary or secondary, it's (the build as a whole, the playstyle, and the player) that matter.
i was thinking what should be the nice combination of powerset for SOLO-TYPE/TEAM Corruptor, what i mean is the Corruptor that can do solo nicely and team... and how to soft cap it? any advice is quitely appreciated!