Glock 17 for sure. The handling of it leaves a good feel in your hands, the compact is good too but if you have big hands then definitely do not get it as after awhile it will feel a bit uncomfortable
Also another reason is because the Marui itself has a lot of upgrades for it and if it breaks there are replacement parts for it as well that can be found on the forums here in Canada.
And since I am unsure if you are from Canada and if you are in the states then you are even in more luck for finding even more parts and newer metal slides.
- Pistolero Steve