Considering adding a lift - thoughts on 2-post vs. 4-post?

I've had a 11,000 lb rated Challenger 2 post lift for 2 years. The lightest car I lifted was a stripped out 65 Valiant convertible. The heaviest was a tie between my 2007 Ram 1500 (4940) and my 75 Power Wagon (4890) The Power Wagon was longer and taller. The lumber rack prevented me from lifting it as high as I wanted but the truck was stable.
The choice really comes down to what tasks you expect to perform. The 4 post is great for oil pan work, exhaust work, transmission, 3rd member, gas tank, etc. Any time you deal with anything where the tires come off, it is LESS convenient than a 2 post by a long shot. EVERY time you walk under the car, you'll have to duck under the 4 post deck. About the only thing I see as an advantage with the 4 post is that the deck serves as a nice place to set tools and parts. With a 2 post, you'd need a wheeled cart or something.
I do not question the stability of the lift. Mine seems great. In the instances where a 2 post lift arm is in the way, I have tall jackstands to use where I can actually hold the car up to 6 feet offof the ground and lower the lift to the ground.