I wouldn't put my trust in a block of wood on a hefty Jag,
Problem with ramps are you have to store them & on cars with wider tyres they never seem to fit.
Wooden blocks on a flat surface won't split, and even if they do it's not like your car can fall through them although I have once had a ramp fly out from under a car when backing up onto it, it shot about 7 feet up the driveway. I still use them for the oil change even though i've got 5 sets of axle stands, 2 sets of ramps & 2 trolley jacks. It's less messing around & I only need the car raised a few inches to get my arm to the sump plug.