Which one of the bottom-feeders to take?

I have one extra slot (for the time being) and am missing the lousiest three-stars: Sentry, Rags, Quicksilver, and IM40. As it happens, I have all four in my cover pile to choose from, weirdly enough, so which one should I take? Is one more useful than the others?
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Quicksilver is an avenger and has been used a lot more than IM40 in my opinion. Do you play pve or pvp??
Daken and Ragnarok have cheaper abilities that means Kamala heals often. And because you have bursty damage, redundant AoE.......They're the group you just lost to.