If you request a specific villa your odds of getting it are very slim. You have to hope that someone is checking out of that villa the same day that you are checking in...plus that someone else didn't want the same villa (or similar request). Also, with the THV's they are new and some of the things like views are difficult to determine just based off the maps, etc.
I would make a simple broad request, based on my circumstances of how I plan to use transportation. If you have a car and plan on driving yourself most places, I would request near the north bus stop, it is near the entrance to the villas and will be easy to get in and out of the area. The roads are narrow and you can get stuck behind busses and other cars. If you plan on using resort transportation, I would request near the South bus stop. This is close to the walkway to Granstand (so you don't have to ride the shuttle for park busses, just walk over to Grandstand), closer to the THV's quiet pool and the ferry dock for DTD.
For the record, the THV's area may look big on the map, but look at it on the big map that also has SSR, the area is not huge and is about the same size as a section of SSR, so even if you are near the north bus stop, the walk to the ferry dock, is about the equivalent of walking from the furtherst springs building to the main pool, etc.....maybe 5 minutes tops. It is a pleasant area and the walks aren't bad if you put them in perspective, it is just heavily wooded, so it may seem far looking at the maps.
As far as THV's vs 2 Bedrooms, I like the layout better. You have more room for the dining room table, but less room between the tv and sofa. Same number of beds, but three rooms, so sleeping arrangements with multiple families, kids of varying ages, etc is much easier. The feel much more like a house than a condo to me.