Depends on what features / ammenities you value.
Some like OKW because it has 2 queen beds some dont like it because there's no couch to sit on to watch TV
BLT is among the smallest
VGF will be interesting with 2 showers and the extra trundle bed.
I would most hate getting the VWL studio with no balcony (just a window)
There's a few BWV and BCV studios with Huuuuuge balconies.
I suppose I'd say my favorite studio stay was in a Jambo studio...because it was awesome waking up that first am to DS at the curtains, "look! A Giraffe, a zebra, and an osterich!"