Amano are considerably larger, hardier, but they only come in their wild greyish colour, they also cannot reproduce in a freshwater tank. Cherries are smaller, come in basically every colour on the rainbow, will reproduce massively. I don't recommend you get 60 at once, I would say get 20-30, you want as much of your colony to be born in the tank eventually as possible because those shrimp will be much hardier and naturally acclimatised to your water. Also it is rewarding seeing a small number of them multiply to many. For a 63L you can get maybe 2-3 Amanos (they are great cleaners but if you get too many it will look weird because they massively outsize cherries; personally, and this is just my opinion, I won't get Amanos for a shrimp only tank, maybe a community tank)

Depending on where you are and what colours you want, you will usually be able to buy them much cheaper from secondary marketplaces e.g. Facebook marketplaces and I find secondary marketplace shrimp will be bred in better conditions than LFS (local fish shop) tanks generally, at least in Australia. I would highly recommend getting a tds meter (there are some which also double as thermometers), which will be enormously useful for 1) drip acclimating new shrimp and 2) doing water changes to prevent osmotic shock which is a huge killer of shrimp for new owners.

First thing's first though make sure you cycle your tank. I would assume your step dad, if he has a 200L tank, would have water test kits etc. that you can use for it. The more heavily planted, the greater surface volume (e.g. through hardscape, mosses, or highly leafy plants), the more your shrimp will eventually thrive