Well they are both good brands no doubt about that therefore both will have excellent durability. And because they are scooters they are made to last without hardly any maintanence (not that i dont recomend maintaning them) because generally people who ride them know harldy anything about them (not teasing you or anything, but its true, how many hard core riders do you see on scooters??). So as far as durability goes, 10/10 for both bikes.
No idea about price. but the most expensive models i have seen that are up to 250cc or 500cc can cost up to $13000. But generally scooters are 125cc, so tops would be 5 or 6 thousand. Cheaper if it's second hand.
Performance on both bikes will be dictated by engine size. anything 150cc and under will be ok for lugging around an AVERAGE human around town but will be extremly unstable and unsafe on highways and speed limits exceeding 70 + km. Get a bigger scooter with more power and your looking at a more comfortable ride + safer. 50cc is ridiculous.
Avaliability of parts for both bikes are easy to obtain as they are major brands, so no worries there.
Appearance, well is up to you.. i like neither, but i'd prefer the beat, as the mio looks like a chick scooter.
The mio is more popular because (without being sexist) 9/10 of scooter riders are women, and the mio is attractive to girls for some reason.probly cos it looks like an italian vespa or some crap. where as the beat looks more sporty and plasticy and probly dosnt appeal to women.
