I've skated forged on up to 14.5, its pushing it a little bit, but its comfortable and stable and I got really good yield on a lot of my tricks even though it took more effort. If I was more atv, skated more gaps and transition and stuff I'd probably prefer it. But since I'm mainly low impact flatground, ledges etc 14.25 is better overall.
14.38 is ok too, but I do notice certain ledge tricks getting a little bit harder even though its more comfortable of a ride.