I like hard tips for their consistency (don't get harder as you play with them), low maintenance (little or no mushrooming) and effectiveness (transmit maximum power). Frankly I prefer the less-jarring feel (and sound) of softer tips, but I can live with that difference in exchange for the advantages of hard tips.
I think the tiny amount of extra power transferred by a hard tip (because it doesn't compress as much on impact) is noticable, and that's one of the things I like about them - but I don't think that means I get more or less spin - I don't think any tip produces any more spin than any other.
I've used Moori hard (or quick or whatever) for years, but just recently decided to try some of the newer layered tips. Right now I've got a Sniper hard on one shaft and an Everest hard on the other (identical shafts). I like them both and use them both equally well, but the Sniper seems really hard.
The Everest has a red layer about halfway down that's supposed to "remind" me to replace the tip when it wears down that far. I plan to ignore it and replace the tip at the usual time, but does anybody know if that red layer is the same leather and consistency as all the others? If it's different this will be the last Everest I use, even though I like it otherwise.
pj
chgo