Either lift is a compromise, you have to sort out what's more important for your needs and how they get prioritized. I went through the same decision process a while ago. A 2-post has better access underneath for just about everything. The down side, it must be correctly anchored to the floor, with sufficiently thick high-strength concrete. That meant I would have had to saw two 24" square holes in the shop floor, dig it out, and re-pour the new concrete. Also, once set a 2-post can't be moved without a LOT of work. I chose the 4-post, as I can do whatever I need underneath. It is movable if needed - I can put the swivel wheels under it to roll it about. It doesn't need to be anchored to the floor although when I find the sweet spot in the shop I will anchor it down to keep everything square. I don't need to get at the wheels or brakes often so I'm OK with driving the car onto the ramps to work on it. If I do need to get a wheel or wheels up off the ramps I made a way to use jack stands to hold the car up in the air while it is on the lift. If I need the floor space for another project, I just hike the car up to the ceiling and I have the full shop floor to work with.
Installation on the lift was a nightmare. It is H-E-A-V-Y. I had access to a forklift which really sped up the process, but this could be done if you are careful, with a helper or two. The nightmare part was the criminally incomplete, misleading, and overall wretched assembly instructions. I finally got it all figured out and really like the lift. But whoever made the assembly booklet needs to be tarred and feathered. Perhaps with a beating thrown in for good measure.
