It also depends on how the manual is shifted. If the driver uses the synchros and shifts down through the gears with each stop, then there will be more wear. Granted the clutch is not a part of the tranny per se, but it’s part of the system that makes the tranny work. Sitting at stop lights with ones foot on the clutch with the transmission in gear will cause considerably more wear on the clutch and especially the throwout bearing. Replacing a clutch on a FWD car is not a cheap proposition. All in all, I’d pick a standard for longevity, clutch included, but today’s automatics are VERY good for gas mileage, positive shifting and long life. I’d call it a toss up.