For awhile there, I wouldn't have considered an RS product. I haven't even ridden a Pike yet, but there's no denying the apparent success of the Pike platform. There's too much obvious positive result from owners posted on this site. I will comment on the Fox 36...Vanilla coil model...since I've been using one. I've never owned a Fox fork. I was interested in the Talas after riding one at I-Bike last year. One of the guys at the shop got one on a Specialized Enduro, and it experienced that sinking travel issue along with inconsistent oddities. I looked at the weight issue on the Vanilla and realized that it is a very light package for such a burly coil fork. It also gets a little over 6" of travel, and it actually gets that travel. If travel adjust is important...never has been to me...then a Van 36 isn't your choice. I'm a little miffed that the Pike doesn't offer a full 6" of travel since my bikes all have 6" or better at the rear. The Pike is an outstanding value while the Fox 36 models are darned expensive. The Pike is only a 32mm fork while the 36 is obviously 36mm...may or may not be an issue for the type of riding you do or the bike it will go on. As to the 20mm fork, I think you'll notice that difference regardless over standard QR forks.
I've been thoroughly impressed with my Van 36RC2. It's extremely tuneable, plush yet controlled, quite light, extremely rigid, and gets all of its travel. It's a simple, easy to live with fork that has a functional high tech damper. It also comes with a lighter and heavier spring for personal tuning. Sounds like you'd use the lighter spring. You didn't mention the bike or type of riding you intend to do. That might help.