I've used both Snipers and Everest. Both are excellent tips. But the Sniper is unique among all the tips I've tried.
When a Sniper is first installed, it feels very soft, almost spongy; but it grabs the cueball like nothing I've ever seen. Play with it for a couple of weeks and it becomes more firm and doesn't hold extreme slow speed spin shots as well. However, once it firms up, it still feels softer than any other tip I've tried. The odd thing is about the Sniper, once broken in, it feels soft yet it holds its shape better than a truly hard tip. It requires almost no maintenence.
The Everest feels pretty soft upon initial installation, too. It will require more reshaping for the first couple of months. After that, it holds its shape very well. However, the Everest starts out feeling quite soft, but continues to firm up as its used. After 6 months of regular play, it feels much harder than a Sniper, despite the claims that it is a medium verses a med-hard rating for Sniper.
The Sniper definitely plays softer throughout its life than an Everest. The sound of the hit is softer with a Sniper, and when both are broken in for 6 months or so, the Sniper will grab the cueball better. To me, despite my fondness for the Everest tip, the Sniper is in a class by itself. It's the best tip I've ever used. Period.