I have Felco 2, 6, 8, and 13.
2 is the standard. 6 has a shorter blade and is supposed to be for smaller hands but it cuts just as well as the others and is a bit more manueverable. 8 is my favorite - in part because it was my first really good pair and fits the hand better. 13 is longer and works very well for intermediate sized pruning, but it is somewhat heavier and requires more hand strength. I've never needed replacement parts for any of them.
I've not tried any of the good but lesser known brands mentioned - but since good ones can last for many years, I'd frankly hesitate buying them since it might be more difficult to find replacement parts if needed in the future. My guess is Felco will still be around and replacement parts readily available years from now, the others? who knows.
If I could keep just one, it would be my 8.
Coronas? Maybe they've improved.