I really can't decide so thought I'd post this question here.

Currently CO Plat (125% bonus miles on each flight) already requalified for next year...
My travel for the next 3-5 months has me on a CO regional jet. Or I could fly US on a larger plane. I occassionaly fly UA internationally (maybe twice a year at most). Most other times I'm on CO (95% of my travel).

Should I
A - Maximize my miles with CO - just stick with them?
B - Spread to UA - have them match me (100% bonus miles) and not be able to get FC upgrades on US?
C - Open an account with US, have them status match (looks like only up to their plat which is 75% bonus miles) so that I have a chance of flying 1stclass over the next few months but frankly earning miles I'd probably only use on partner airlines?

Any Status matchees out there have a suggestion?