Great question. I really didn't feel any advantage/disadvantage of either outside of the room that made a big difference to us as empty nesters.
I could see that the
DVC 1 has its own vehicle pull up load/unload that's separate from the main entrance, so that's a plus. DVC 1 also has a nice lobby to enjoy with a cool penguin fountain.
Both are close to pools with DVC 2 being closer to the hot tub which we use. In DVC 1 we had lake view Studio in March and loved the nighttime view of the Poly and could see the Epcot fireworks and we saw a wedding in action which was fun to feel the happy vibes. So, if you're lake view, that was nice.
In the end, both are great, but until the DVC 1 has the updates of DVC2, we're staying at DVC 2.