I stayed at the Westin Guadalajara for one week and the neighboring Hilton for one week. The Westin is hands down the better property - everything looks new and shiny, unlike the significantly older Hilton. The lobby and restaurant area are very nice and quite impressive considering the price (about $120/nt). The food and drink are about the standard hotel price though I would rate the meals above average in terms of taste and presentation.

As an SPG Plat, I booked was booked on the cheapest breakfast package room but was upgraded to one of the corner suites. The living room area was decent-sized, enough to have a few people over for drinks. There was a separate half bathroom as well.
The Westin also had a pretty nice gym with slightly newer equipment and a bit more room... It seemed like I was the only person who used it though and would have to make sure to take a walk around the room as the lights would turn off after 10 minutes unless you triggered the motion sensor.

Definitely no pool, unless you count the decorative "bubble bath" as one