All depends on what you're doing and what you want.
In my experience a 4 post can be handy for some things like storing a vehicle and basic maintenance.
The downside is they're in the way most all the time either up or down unless you have a very generous sized shop.
The two post might be more trouble to set up but for a hobby shop how often will you be lifting a vehicle?
When you do use it it's a pleasure, most everything is exposed and easy to get to. Worth that little bit of trouble to set up I think.
Smaller footprint in the shop.
I suggest working under one or both types, check out the options first hand and see what actually works for you.
