The P-64 is smaller than the Mak. It's basically a copy of the Walther PPK, along with it's slide mounted, push up-to-fire safety that's difficult to manipulate.
The Makarov's safety is hard to operate because it's roughly machined sometimes on the area the safety spring contacts, and therefore is stiff.
However, it's PROPER... in other words, down to fire, just like a 1911.
You'll find the P-64 easier to conceal, the Mak bigger and infinitely more reliable.
Flyer