Best gym in South San Jose?

I'm torn between Retro Fitness on blossom hill and 24hr Fitness on Santa Teresa. These two gyms are on my commute back home from the 101 to gilroy, but I have a few questions. What's the best one? Size comparison? Which one offers a better service? What are the peak hours? I'm planning on going between 11am and 2pm.

If you guys have any other gym suggestions that are near the 101 I'm open to hear about them!