Ditto on MR, but only as primary. Concentrate the first ~60 per year with MR, get both credit cards, get auto HH Gold with their card and MR plat with their +15 nights. Whatever is left go to whoever has the best promo going on - right now I am 2014 MR plat but staying at HH for the quadruple points.

For me, little discernable difference between chains nationwide, more important to pick the one I want when I go specific places. Never had a place that doesn't have at least one acceptable option between those two programs.

[added] If your goal is a nice place overseas, you have to count the crazy devaluation of HH points for those type of places. I got 7 nights at MR Rome for 240K, HH would have been double. Granted HH points are easier to get, but not twice.