Hmm, have had at least 4 of each. 456 for me. Both cut just fine for me for my needs. No difference there for what I need a knife for. The 456 is a lot funnier to just flip and fiddle with imo and zero lockstick, which happens to be in my top 3 of knife pet peeves. And every Chef I have had had some level of stick. But that might not be a concern for you. If you are not into heavy pocket knives, run very fast from the 456. It is a chunky monkey.
In the end, though, every time I was weighing between two knives I always ended up with both. So, you got that to look forward to. : )