My #1 choice would have been the Lola. Looks the best, most simplistic.
Dallara will be nice I guess, looks a bit sleeker than the current ones, and gets back a bit to the early / mid 90's style. Swift was a lesser choice, but would have been nice to have Lola + Dallara or even + Swift.
BAT and Deltawing are abominations and should never have been in consideration. The designers of them should be prohibited from further design for IndyCar.
If only they could bring back the hanford device and go back to tracks like Michigan and Californa with it, would be most epic.