there are 2 moderators from mfm that are in here. feel free to ask in here if you're nto comfortable over there.

why better ?

china made ones run on mostly garmin or papago. some igo as well.
most of the devices are on win CE 5 so they are capable of running garmin and papago, both at the same time.

leaving legit questioning aside, the china made devices can also use mfm maps which require no unlocking at all. they are cheap and appealing.

the difference between a china produced brand X and a branded reputable device is simply legitamacy and some hardware (chipsets and graphics processor).