I have auditioned all three, and here are my comparisons:
All three are fully over-ear (your entire ear), though the P7 will do best for the largest of ears, Momentum 2.0 for the most sensitive of ears, and M-100 for the toughest of ears (there are XL pads, which I have not tried). Clamp force can be adjusted by stretching the headband for all three, just don't stretch them too far out or in opposite directions.
The M-100 is best for EDM, Top-25, Rap/Hip-Hop, etc. for the bass and sub-bass quality and impact.
The P7 is the best all-rounder for those looking for those looking for a spaciously V-Shaped sound, or softer bass and treble extension.
The Momentum 2.0 is the best all-rounder for those looking for a intimately mid-centric sound, or softer mids and vocals.
Since all three are portable, I figured form and comfort are more priority, hence the first ear cup shape comparison. However, sound does contrast between the three as well. Also, the Momentum 2.0 is currently the only one with a wireless Bluetooth model, though there is a Crossfade Wireless and P5 Wireless (soft on-ear) as well.