I've used the x431 and the autel unit. The autel is vastly superior. The processor is faster and the coverage is better; also, wifi updates are freaking godly. I really like having wifi and remote desktop. The downside to both units is they boot relatively slowly and you have to kind of know your way around a vin number if you want to access data quickly compared to something like the solus. Still, I sold my x431 and bought the autel.

As far as euro coverage goes, pretty much any tool will work for VAG. Both x431 and autel have pretty good coverage for benz/bmw. Autel has jaguar and land rover, which I actually use; don't believe x431 covers either very well last I checked.

Rhett Yurgin
Technician
Yeargan's Automotive
Carrboro, North Carolina, USA