Guppie,
There is a very different feel from a Scubapro Classic BC in which the air in the air cell rotates around as you change position and a back bouyancy rig like a transpac with wings. Both setups you mention are very nice and if like most people you do virtually all your diving with single tanks it would be hard to go too wrong with either one. You are smart to try them both out and see if you like the rotating air pocket feel of the Classic before buying.
I dive a transpac with travel wings and really like that setup. I purchased a used Scubapro Classic to try it out and found that I prefer the Transpac/wings setup. If you will do most of your diving using single tanks or when traveling, the travel wing is very compact and provides plenty of lift.
I purchased the integrated weight pockets for the transpac and ended up taking them off my rig and going back to a weight belt. Using a weight belt I can place the weights over my kidney's which helps to keep more of an upright position in the water at the surface with a fully inflated wing. I found the integrated weight pockets to be a bit bulky for my taste. I also put one of the two zipper pockets on the transpac and find it usefull for holding a small light, signal mirror, slate or other stuff I want to stow away.
If you end up buying the transpac from Leisure Pro you should verify that the wings will come with the inflator hose. I believe some time ago they were selling the wings and inflator hoses separately. This may no longer be the case.