Alex,
Pass this message up the food chain.
vAuto user here. Can't help you with product comparisons, but, I do have some eye opening observations that may help.
The MOST IMPORTANT decision will not be which platform is the best, that's easy. What's going to be PAINFULLY hard is what you're going to do with all this information. The information vAuto presents is the kind of information a field general needs to make tactical decisions on the fly. The better data the field general has the better he can out maneuver his enemy.
Make no mistake about it; the information presented by the vAuto platform will turn on a light in a very dark room. You can use it selectively (as needed) or forcefully (across the entire inventory and enforce at all times).
So, to summarize...
It's all about attitude. To embrace change, or fear change. The information will FORCE your management team into uncomfortably productive discussions of letting go of treasured 20th Century business models and into the 21st century battlefield... the Internet.