For USB, there is no more fast(est). USB mobile sticks are a dying market, newer better ones arent developed anymore, I think you cant find faster ones than 4g 150mbit.
Manufacturers have switched to mobile Wifi all-in-ones routers instead.
Lots of forums claim the issue that there are often 5-6 minor variants on many Huaway USB sticks, some of which have firmware issues and no firmware updates available. Often the good variants are rare to find. So if going Huawai, because you read recommendation, try to get precisely the same variant.
Due to that selection difficulty (and because I ran into a cheap offer), I went for Alcatel last year, as there was just a single variant of that stick: