During my 24 years in the USAF I was lucky enough to wrench on these aircraft at one time or another; B-52G, D and H models, KC-135A and Q models, FB-111B, C-130A, H, NC, and V models, A-7, F-16, F-15, A-10, TR-1 (U-2), SR-71, UH-1H, CH-53, F-4H, OV-10, F-101, B-2, F-117.
I was also able to work on these aircraft as a volunteer for air shows and over hauls; B-17(assisted in the over haul of the original Memphis Bell in 1988), P-51, and a P-47.
I actually had the chance to sit in the nose of the Memphis Bell one night, after a long day of work, during the over haul we did on her, and drink a beer while looking at the stars through the Plexiglas. Call me melodramatic, but I couldn't help but get goose bumps thinking about the history I was sitting in.
As far as a favorite; that's tough, but I'm partial to my Boeing aircraft, in particular the B-52. The most fun to fly around in to me, was the UH-1H; had some great times flying in the hueys.