I think whichever color scheme works better depends on the universe you're imagining your character to be part of.
An assassin/agent style character is supposed to fit in after all.
For example. If you're imagining a sort of country theme, then I think the top right, with its earthy colours works better. But bottom right could work really well in, say, Ghost in the Shell's universe.
I think each colour palette works. If you're still unsure about them, how about working on the backside in the meantime?