I have both.

I mostly buy the Weaver Bases and the work just fine. I did buy a used gun that came with the Leupold and they are really nice and very very solid.

When I needed new bases for my 7MM Weatherby, I paid the extra for the Leupold's.

My thoughts, Weavers will work just fine. Leupolds are the best but you pay for them. Kind of like many things in life.