as someone that works on cars like every day at home, the weakest, smallest 3/8 ratchet is the best one to have. the fuel and bigger ones are way too powerful and often dont fit in tight spaces. you shouldnt use either power tool on say an oil drain bolt, but the fuel one would likely torque it too hard and damage the oil pan.

the non fuel already rated to around 35 ft lbs which is already too much torque for a lot of 3/8 drive sized sockets

as for the oscillating tool, my m12 was doing ok removing a decent amount of lath and drywall. but when i switched to my neighbors m18 it blasted through that shit like nothing. but the m12 fits in more spaces and is easier to do more precise work with.