I will follow Kylo’s career with great interest. But it’s notable in how he has changed (or rather, not changed) so far. We haven’t seen him as anything other than a tormented soul in either of these movies. Compared to Vader, who went from a ‘Leave it to Beaver’ kid to a Republic hero to a genocidal monster to a repentant soul, and Kylo hasn’t really moved from his angst at all. Granted much of Vader’s other aspects arrived with ROTJ, but Kylo’s biggest change has been going from wanting to destroy the Republic to wanting to destroy the First Order too.
Well, besides the fact that I disagree with the assessment that he hasn’t changed that much, you have to admit you’re comparing 2 apples with 6 oranges here.