I have a 350 magnum .177. It is just fantastic. I like the power from my 350, velocity is better than HW/Beeman springers in .177 and .22. When using a strong 350 a heavier bullet is not a bad choice.
HW/Beeeman are springers too and not any better in my opinion. 350 difficult to shoot, not if you can handle a heavy gun. By the way HW/Beeman 80/R1 rifles are heavier than a 350. HW 95 is a bit lighter in weight and is less powerful than than HW80.

350 comes in a few configurations. Among them: magnum, classic and panther (synthetic). All are mechanically equally built. The stock and sights make the difference.