We've stayed Concierge only once (Polynesian) and that was only during the Fairy Tale Package (hadn't bought into DVC at that time). Other than any "prestige" value, we identified two main benefits of Concierge:
1. The planning/scheduling services. While I'm certain that some folks take advantage of this, it wasn't much use to us. Between our do.it.ourselves attitude and the fact that we prefer to have less rigid schedules, we just didn't use this for much than a couple of PSs.
2. The food. While this was nice - iced bottles of water available, rolls & bread for breakfast, snackie meats & treats for dinner - it wasn't worth the cost. Plus, even with just a DVC Studio, the fridge, toaster and microwave makes it easy to have warm bagels for breakfast, sandwiches for lunch/dinner and cold beverages 24/7. Add in the full kitchen of a 1- or 2-BR and you're set for all meals.
And yes, the added room does make a difference; not to overuse the DVC cliche, but it does feel more like "home".
So - IMHO - DVC seems to be the better choice....