My wife and I like to swim, especially on trips. As such, we hit the hot springs in Glenwood Springs a number of times on our recent Labor Day trip there. We actually went four of the five days of the trip, and only not on the fifth due to running out of time. Of the two possibilities we knew of in Glenwood Springs, we went twice to both.
It’s hard to say which I preferred. Each had some pros and cons. Glenwood Hot Springs was cheaper, and had more history feel about it (part of their facilities dating back to 1888). However, they only have two large pools (one 98 degrees Fahrenheit or so and the other 104, I believe) in one big area and can be kind of a zoo. Iron Mountain Hot Springs has tons of little pools that are somewhat isolated from each other (ranging from lower 90s or so all the way up to 108). It’s more expensive, but less of a zoo. Swankier, which can be both good and bad.
Bottom line, I can’t really decide between the two. I’m kind of glad we went an equal number of times to each.