Kingston and SanDisk flash drives are both pretty good, with Kingston being more expensive and a bit more durable.
Kingston and SanDisk both have high-end flash drives that use solid-state hosts, as well as a large number of low-end and mid-range flash drives that use common hosts. At present, the mainstream low-end flash drives use tlc, mlc is a high-end mainstay, which requires additional money, and in a few years' time, mlc may be extinct, and qlc is popularized, so that tlc will be the mainstay of the high end.
Kingston main force is the conventional u disk master, there is the use of very high-end customized conventional u disk master high-end u disk, seq speed is very high, there are also solid state master high-end u disk, the price is extremely high. SanDisk high end basically masters high performance masters, similar to solid state masters, with very good 4k speeds.
Low-end u disk, SanDisk has a lot of u disk using independent research and development of conventional u disk master control, which some of the master control of the 4k speed to be significantly higher than other brands of conventional disk master control, can be said to be the conventional master control of the 4k speed of the highest class, cost-effective good.
I think the u-disk as long as it is really genuine, as long as it is used properly, generally no problem. Kingston SanDisk Toshiba common can be used. But the fake high imitation ones usually don't get much use before they break, and there are also expandable USB disks that don't work.
U disk has a price, the data is priceless. It is not recommended to buy a cheap USB flash drive, if the economy allows, it is still recommended to buy a more expensive and better quality Kingston USB flash drive.