Well 3 of the top EU teams (Gambit, Acend and Liquid) are in a slump right now but Fnatic and FPX look like those teams did at Champions, maybe even better. Guild can be top but they have to fix their strategies. Individually Guild are fine though.
There is a big skill gap in NA. C9, V1, Guard look way better than other NA teams. Fnatic and FPX look way better than everyone else in the world. All depends on if Fnatic choke or not. Sentinels were the better team in Masters 2 but Fnatic still choked some maps and they choked vs KRÜ in Champions too.