I agree that the B is perfect. So easy and user friendly. I will be honest the clasp on the 24/24 does bug me and like with my Kellys I just leave it open when I’m in a hurry checking out at a store, etc… However I look past it because I love the aesthetic of the bag. So if I find a kelly in a color that wows me maybe I can move past the annoying clasp like with my 24/24My first H bag was a vibrato Herbag about two decades ago and I found (and still find) the clasp fiddly. I was sure that I would never want a K as I thought them too ladylike: prim and proper which I am definitely not. I have three Bs (one in each size) and for me they are perfect: I love the easy access and am okay with carrying them by hand or over my elbow. I now have a 1999 K32 retourne which I enjoy wearing...I don't find a retourne too ladylike and I have a couple of interesting straps that further relax the style. BUT I still find the clasp slightly irritating. It's not hard but, compared to the easy access of the B, it's annoying. I also have a 24/24 but a 35 which does not have a strap so great for work but, again, a clasp to deal with.
So the short answer: if the clasp is what bothered you about a K, it will still bother you. But if you love your 24/24 maybe the clasp issue is no longer an issue?