what iso's are a must for ultimate ventoy disk(and what size is recomended)?

hello guys i am wondering what are some must have iso's for a ventoy drive? and what size ventoy drive would you recomend (i am considering buying a 512gb, 1tb or 2tb tranced 220s nvme)

Back story: So i recently started my own "business" in computer support and i need a drive to put ventoy on (its currently on a 32gb micro sd card) so i can easily have memtest, ultimatebootcd and some linux distro's/windows install media and i am wondering if there would be any reason not to go with the cheapest per gb drive(2tb) as i could then also use it for some nice snappy file transfers. I am also looking to compile a list of iso's to put on it. As i mentioned before i already have a few things but you guys probably have more suggestions for iso's to put on a drive for repair\troubleshooting.

Thanks in advance for your advice on drive size and ISO recommendations.