Here's my take,
I have an American made four post lift. The manufacturer is now defunct, and yes I had a failure. The locking mechanism on the lift was a horrible design. My lift failure was not related to operator error or the quality of construction, but rather bad design. The switch used to operate the lift failed in the on position. In my case, a low ceiling and a lack of a primary electrical disconnect at the unit (my own fault) resuted in ramming my CJ-7 into the ceiling. When I buy my next lift it will be American AND CERTIFIED.
Now let me address the original questions. If your garage is on the small side your really going to want one of the smaller units. The larger units will take up most of your garage. The flip side is that the smaller units are a bit of a pain, particularly if your approach is not dead parallel with the lift. I love the four post style for overall safety in stabillity. If you actually want the lift for service, like myself, you need both styles. The two post is great for brake work, suspension and certain exhaust applications. My next lift will be a two post design to compliment the four post I have now.
As a side note, I make every effort to purchase AMERICAN made products, I always have and always will. If American made products cost more, I'll wait untill I can afford them. It saddens me to hear that Bend Pak has gone the way of the Chinese as that was what I had wanted. I'll have to see if they still manufacture some American units.