They all scale occurring to your upgraded weapon stats, so those are misleading. For example, Ludwig's Holy Blade is setting at "D" for strength, but the more you put into your attribute the higher it gets raised. I'm sitting at a "B" for that weapon. Zoned out on that for a second... weapon stats that get upgraded, not your own.
Ah, I see that now. So, does it make sense to stick with the Saw Cleaver? It goes from D to C, which isn't very helpful.