black and red pill are both probably the most powerful for self interested ends, but the orange pill and grey pills allow for the most reality bending of situations.

I'd probably go for the black pill, make good documentation of working somewhere and making no mistakes, then trying to sue the company that fired me if I can find a reason to.

If I were much braver, I could use the Red Pill to act as a technoprophet or to blackmail large portions of the tech industry (they just have to believe I can permanently black them out on command, the fact that I only have 100 of them is more than enough to make them believe it), but alas, I am not nearly brave enough to try and pull a stunt like that.