Ride quality on stock 20" LX Wheels

[SWUtah]

In the closest to stock LX570 size, there are two different Michelin MS2s. Which one are people using/referring to? There's a P-metric (P275/55/R20) and a Metric (275/55R20). Looks like there are differences in load rating and tread depth.

https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=LTX+M/S2

Either one will work.