I should have more than 250 nights next year at hotels mostly in Washington DC and I am currently a platinum Marriott member. I want to mix things up next year and am looking for another chain to split my time. What chain offers the best/most frequent upgrades for my regular stays? Any tips for DC hotels?

I plan on using the miles for high end vacations and prefer Europe or Hawaii. Which has the best hotels for the rewards I am looking for?

Looking for advice on which chain I should attempt a status match.
Thanks