Evo owner here. I’m very happy with them but then I got them in a sale a while ago for £25, not sure I would pay RRP for them.
The fit is different to the KS they seem to have more “slack” in the middle if that makes sense so I can see why they bunch behind the knees for some people. They are better ventilated so longer rides in them are less sweaty but obviously not as cool as no pads.
The key bit is of course protection, in this respect I’ve not had any problems with them they’ve taken plenty of tumbles on to rocks and roots and my knees have been fine having said that I don’t think I have fallen on anything sharp with them so can’t comment on how they would deal with that, no better than the KS I’d imagine.
If you can try them out first and they fit and find them on sale get them otherwise I’d go for the KS on a VFM basis.
Ultimately I don’t think the RRP for the Evo pads is down to materials probably the licencing for the “d30” padding.