Alexi says his hardest solos are on the old albums. There has been some debate about that but IIRC the consensus was that the hardest stuff was on the later albums?
As a guitar player, I say that the solos on the newer albums are definitely harder to play. But I can understand people how say that they think, the older ones are harder because they are faster.
Of course they sound better. The only good solos in the last 15 years Alexi did for CoB were the ones in NMF and Ugly. HoB also had a few good ones but the time is definitely over. Alexi is still an awesome songwriter. I really don't know a better one (personal opinion) but he went from a solo-god to nothing more than a average lead guitarist with basic skills. And this has nothing to do with a broken shoulder or wrist.Maybe they are easier to play in a way, but for my ears in many cases they sound better. More melody, more to remember easier to evoke.
Btw, I have never compared HCDR and HOB, but HCDR is definietly on the technical side. Chokehold Solo is one of the best "mashup" of old & new Alexi-techniques.