Personally I think the 3X10 is one of the finest deer hunting scopes money can buy. Plenty of power, top notch glass, lightweight, mounted lower, and a reasonable price. Price is a bit high, but still not crazy priced.

The 50 might pick up a tad bit more light. But I have all the light gathering I have ever needed with the 3X10.

I know the 3X10 is my go to deer hunting scope. And I have both you mentioned, plus the 6X18. Tom