I don't have a (practical) choice in the matter. Currently, all my travel is on my own nickel. I negotiated a very attractive rate at a Fairfield Inn, so I get Marriott points. The Hampton Inn next door wouldn't deal.
Since I'm in a hotel every night of the work week, I can't justify even the $50/night or so premium it would cost for another chain, although I did do it gladly for the HH ACAQ promo - the net points were worth it.
So - as long as I'm paying 100%, the relative attraction of SPG or Hyatt or the others is pretty moot.
However, when the company puts me back on the road, I'd like to know which way to jump.