I am limited to a variety of prop aircraft (Cessna 152,172,177,182,210, Piper warrior, archer, arrow, seminole, Diamond Katana, Beech Duchess, Citabria).

My favorite is the DA-20 Katana.

Of military and commercial jets (of which I have not flown yet), my favorites are the F-15 Eagle, XB-70 Valkyre, Boeing 757, and Gulfstream G5.