Two very different choices. Miner's Club, in my opinion, is a far, far, far better property. Location in summertime is not great. Nothing really right there. One benefit is that you can easily get to the July 3rd (not 4th) concert and fireworks at Canyons Resort. You're also neighboring the Waldorf with a good restaurant (although had a not good experience this summer). Park Plaza isn't at the same level. It's also in a residential/commercial district, not really a resort-like setting as Miner's Club. Good thing on Park Plaza is walking distance to a diverse collection of restaurants.
Honestly, if you're looking for a really nice property with nice amenities, I'm sorry, I don't think either one of these is what you're seeking. Do you have any other options?
Summary, Miner's Club will give you better room, better mountain setting and view, nothing in walking distance. Park Plaza will give you lesser room, no view, fair amount in walking distance.