Depends if you want to store a car or work on one.
2 Post is better if you want to work on a car. It will require a higher quality floor with very little slope (< 3 degrees I think)
4 Post is better for storage and does not require your floor to be as good or as flat
You can get add ons to your 4 post to so you can work on your car but that is an additional expense.
Some 2 posts you can unbolt when you do not need.
__________________
Signature
|