A lot of people will say that the "Mauser' is newer and built better.
I don't know, I am sure that is true, but the DWM's and my Erfurt artillery shoot fine
Ask if they have shot it. I have sold many shooters 'as-is' simply because I bought it with something else and sold it as a 'shooter category'. Not buyer beware, but the truth
Anyway, as said above, ask if they have shot it - some of our guys have put a lot of effort into their 'shooters' and they are great shooters.
Buy a 9mm - much cheaper to shoot and ammo is much easier to find. Yes you can find Fioci (sp) for a decent price, but still about 2.5x the price of a box of Winchester white box....