Formatting USB flash drive

Hey guys. So is it safe to format a usb flash drive? Also, why do usb flash drives come in the FAT format? Isn’t NTFS better? So can I format it to NTFS?

Thank you.

USB pens aren’t 100% reliable, because, they can only be read / written to a certain number of times, so, as the USB pen ages, so does the reliability of the pen

look, this was getting too complicated, read this

Edit:

as long as you realise you will be removing the data on the pen (well, the ability to easily retrieve the data)