Depends on what you like! I love my flex ons, however I recently realised I don’t like how wide the pad is for my foot. I also like freejumps - but I personally don’t like the safety aspect. I used to get knee pains until I tried flex on!
I love my Flex-on aluminum stirrups, also have the freejumps but I personally prefer flex-on
In lorenzini’s my jumping position is worser than in sprenger and freejumps soft up lite