372xp advantages:
Simple, proven design. Lighter weight than 5-series 576/572. Smaller chassis feels more maneuverable. Quad port transfers, good power for 70cc, can run a 24” bar, manual tuning carb. Lots of parts availability new, used, and aftermarket/clone.
Disadvantages: older design, AV not as smooth, fuel efficiency isn’t as good, but got better with the x-torq models.
576xp advantages:
First gen auto-tune so no more fussing with carb adjustments. More power than 372xp, can run 28” bar. Very smooth anti vib, better fuel efficiency with x-torq strato cylinder design and auto tune.
Disadvantages : first gen auto tune, missing some features and they were still working out the bugs. Heavier than 372xp. Silver paint wears off too easily. Feels like a big chassis. Auto tune more self-contained, not to connect to computer for diagnostics.
572xp advantages:
Latest design, smooth AV, great fuel efficiency, very good power for 70cc, third gen auto tune, built like a tank, big beefy bearings, better paint, improved air filter design.
Disadvantages: heavier than 372xp, expensive, early in product life cycle so possible changes may still come, bigger chassis feels like 90cc saw, more complicated to try to fix yourself.