Seeking wisdom from those who have installed a lift

Look at the different brands.
I have a Weaver from the good old days built in 1986. Rotary bought them out in 89.
Symmetrical style and it has the floor plate, which I thought might be an issue but in 10 + years never has been. 9k cap.
It's built like a brick $#1t house. Solid plate, not thin stamped bolt together columns, and the column bottom plates are huge. Spreads the load out further.
I look at the 10 or so year old rotary I work off of at work, same capacity, and like tin as compared to mine.
The only newer one that comes close to being as stout is a Mohawk. And those ain't cheap.
As far as concrete specs it's funny how that the different lift companies vary in their specs for how much concrete is needed for 2 lifts of different brands and same supposed capacity