Depends on your needs, but if you ever plan on printing more than 1 colour in a single print then an AMS (Automatic Material System) is almost a requirement.. it can be done manually but it's a pain in the butt. The printer has to stop the print and wait, you have to retract the filament, put in the new one, and continue (it's a bit more complex than that but that's the basics). If you're just switching between two colours half way through not a big deal, but for something complex like a dog with a face with different coloured eyes and nose then you might spend more time switching than printing.
The AMS will let you switch between colours automatically.
The two different AMS options in that printer are as cKy said, quality of life stuff that might be worth the $$ depending on how much time you spend printing. The dryer is nice (though you can buy an individual filament dryer for pretty cheap, but that only dries one at a time), and the more expensive AMS is probably more serviceable for when things eventually need fixing and better for more advanced filaments (like carbon fibre). But if only ever printing PLA it might not be worth it (I've never had a filament moisture issue but I've only ever printed PLA and my house is pretty dry).
Keep in mind that multi-colour printing does generate quite a bit of waste (see the two pictures of the prints I posted a while back, the one on the right would be what the P1S would generate) unless you get a printer that's designed to reduce that (which of course costs more money). But for personal prints that might not be a big issue.
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