There seems to be quite a lot of debate about which is more expensive, and devs tend to agree that it is contingent on the type of game being made. That's neither here nor there, though, as a matter of personal preference.
What I will give them credit for is that the weapons you attain are far more useful than previous titles. If I'm being honest, I very rarely used attained weapons for anything other than boss battles (the obvious exception being metal blade). But in 11, there are plenty of circumstances that give you a strategic advantage to in changing weapons multiple times in a single map, and even during boss fights while you set yourself up to use their weakness. They certainly did that better than any title before it.
What I will give them credit for is that the weapons you attain are far more useful than previous titles. If I'm being honest, I very rarely used attained weapons for anything other than boss battles (the obvious exception being metal blade). But in 11, there are plenty of circumstances that give you a strategic advantage to in changing weapons multiple times in a single map, and even during boss fights while you set yourself up to use their weakness. They certainly did that better than any title before it.