Mobile 1 on my cars, just because it is habit and we use it in the track cars and is readily available.
But.... will your engine last on dyno oil until 200,000 miles if you change it regularly? Probably yes.... I have yet to see an "end of 200,000 mile" test using both types, side-by-side, on the exact same engine type to show differences in wear. Unless there are extreme factors involved, it generally won't be your engine per-se that kills your car at the end-of-life... it will probaby be some type of high tech gadgetry that has gone "poof" that will make it financially unresonable to fix at that point in time compared to a "then" used car or new car purchase.
Track Rat #1 - VF supercharged e46 bimmer
Track Rat #2 - Kona 5.0 Premium | 3.73 MT82 | 400A | glass roof | saddle int. | Brembo Pkg | Com. & Sec. Pkg | camera | HID | Nav | no stripes | MM camberplates | Bilstein springs & Eibach dampers | Stock 368 RWHP @ 6700 / 354 TQ @ 4375 - Build Date 6-17-10
Sunny Day: Kawasaki 1600 with hypercharger and tune.