I run Sanwa PGS-LH II servos in most of my vehicles. I have a couple of Sanwa PGS-XB II that are super strong, wicked fast and precise. Sanwa PGS let's you tune the servo behavior and I have an M17 to tune with. Often it's the tuning of a servo that drives individual preference. However, I haven't found a lot of resources for PGS setting so YMMV.

I also have a couple Pro Performance XTS600-HT that were great as well. Similar to my comments about the XSC150P the tuning of the XTS600-HT for turf/carpet is great out of the box. I now run these in my loaner cars for friends, and they have held up to a lot of abuse.

The Protek 160TBL seems to be a super popular recommendation on the forums.

I have one Savox Black Edition LP that is fine, but does drift from center. It's also the noisiest of all. I think it's because it's the only composite body servo out of all. The tradeoff is it's significantly cheaper and lighter then these other servos.