MoogleEmpMog said:
I've played a lot more d20 than HERO and find HERO much, much simpler in play. The powers in particular are simpler than *feats* and an order of magnitude simpler than spells, IMX.
First off, it depends on what d20 implementation you're talking about.
Second, it depends on how much of the HERO ruleset you're using. You throw in turn modes, acceleration/deceleration, tracking END, martial manuevers that involve calculating STR effects on damage, Adjustment Powers, and so forth, and you're way more complicated in play than default M&M2e. Fudge most of that stuff, and you're simpler than default M&M2e.
Anyway...
Arashi, you're probably going to be most interested in HERO/Champions, GURPS, or MEGS/DC Heroes/Blood of Heroes. The last one is not currently in print, however.
Of the three, HERO/Champions has the most supers support, as well as excellent overall support (e.g., it has, hands down, the best chargen software for any RPG ever). Head over to
http://www.herogames.com and ask for guidance on the messageboards, and take a look at their Free Stuff page. If you take the plunge, I'd recommend starting with
HERO System Sidekick, which is a 128pp distillation of the core HERO rules, and only $15. If you like what you see, you can move on to the 500+pp core rulebook and the 20+
Champions supplements they've produced so far for 5th edition.
Also: You're going to want to stay the heck away from
Silver Age Sentinels; it's simpler than M&M2e, and also essentially no longer in print.