I'm having to book a trip xSFO an due to the UA hub 'tax' (ticketing on UA is 2x more expensive than on anyone else), I need to pick another airline.

I get miles both on CO and US, and as 1k I get EQM/EQS credit and 100% bonus RDM miles. So it seems that they offer the same benefits.

Looking at the UDU threads it does not appear like CO offers UDU to UA flyers yet, so does my choice boil down only to routing/aircraft preference?? How about SFO-CLT on an A320 vs. SFO-IAX on CO 737 'shuttle'?? Does the CO shuttle have AC power on their seats as written but not shown on Seatguru??

Thanks in advance