They're both good. It's just the way how people treat "copycats" in which we think that Kailh is bad just because they are related to Cherry in terms of shape etc.
Since Cherry has been out for long and have a very good reputation, you should be going for Cherry in all cases. Though if you're going for Kailh, there's no big deal for it.
If you want Kailhs though, I'd suggest a TTe Sports Poseidon Z. It's cheaper but has better build quality than Razer's keyboards.