Topre and Cherry are two different worlds, they are very different and I can't draw many parallels.
I've found my FC660C to be less tactile, and a tad bit heavier than my Novatouch, even though they're both supposed to be 45g.
In comparison to reds, which were on my daily driver before going Topre, I'd say that they remind me of the Novatouch, and the FC660C remind me of blacks. Either way, no Cherry I've tried gets on the level of smoothness or sound level Topre has, so Topre isn't leaving my side ever, if I can help it. Sound to me is a big thing, so you should definitely look into Topres if you enjoy quietness.
If you're into smoothness and have a thing for quiet things, Topre is your guy. Again, it's hard to compare the two. I'd go on youtube and watch videos about keyboards with Topre switches, and read up on reviews on GH and DT. And if you're interested in getting one, you should, you won't regret it (but your wallet will).