As stated before I have over 40 chucks of most all major brands and as I'm sure I have stated before I do not consider one brand better than the others.
I only have a dozen chucks, about half are Nova and the other half Vicmarc. I have both because that gives me wider range of jaw sizes.
I've been using both brands since they first came onto the market and I have used them a great deal since; none have failed in any way. like Bill B, I have not found either brand better than the other.
As I often don't know which brand I have on the lathe or just picked up, I have hand engraved the opening direction next to the key slot on all of them with ---> 0