It would be PS3ita for me, as I am mainly a DEX user. I used to predominantly use Rebug for both CEX & DEX, but for CEX I'd have to say that Habib is probably my favourite, purely because of the integrated COBRA features. I know Rebug has now implemented COBRA features, but the latest Rebug firmware didn't seem to like my CECHP03 console very much.
EDIT:
As for being banned, I have been using custom firmware online for a couple years now & I've never had a console or account ban. I've had a few game bans, but that's about it.