I have two systems. Canon EF and Yashica C/Y. Why? Each offers specific exclusive advantages, features simply not available on the other. I can't get decent digital scans of images anywhere that rival native digital photography. I won't take a $1,500 camera and lens setup into a harsh environment. If I trash an old Yashica body and lens, even the good ones are available for next to nothing on e-bay. About two years ago, I got someone's deceased mother's camera bag and contents for $50, including shipping. It contained: 1 FX-3 Super 2000 body in excellent shape, 1 standard DSB 50mm f/1.9, 1 50mm f/1.9 MLc, 1 28mm f/2.8, a Vivitar (Tokina) 28-105 and an automatic flash unit, all in working order. I kept the camera and the 50 MLc and donated the rest to charity. What a steal!
Some really good equipment is out there for next to nothing if you are willing to shoot film. I have a Yashica 135 f/2.8 MLc for next to nothing, a Series 1 70-210 for $99. When printing at normal sizes, up to 8x10 or so, I don't see a bunch of difference between these lenses and their modern counterparts, the 135L and the 70-200 f/4.
I tried shooting EF film (Elan 7NE) and it didn't work for me. I like the totally manual aspect of old-style film photography.