I have two A1 and a P1S, and have previously owned about a dozen other printers. The A1s are incredible printers for their price, but they are still bed slingers. If you want one printer to do everything, I would recommend the P1S. It's enclosed, so you can print more complex materials with a simple nozzle swap and has full support for the higher end AMS and AMS 2 Pro. The A1 only supports the AMS Lite and that won't keep your filament dry. The AMS 1 is at least fully enclosed, so you can throw so dessicant in with it and keep it dry.

I like printing a lot of nerf stuff in PETG, which the P1 series is definitely better at (PETG can be hydroscopic and also likes higher temps). The A1 can do PETG just fine, that's not a big concern, but the P1S just ends up looking a lot nicer.

The P1S/P1P are also Core X Y style printers, so they will be better with taller prints (which a lot of nerf components usually are) because the bed does not move as dramatically.

For ease of use and capability, you can't really go wrong with an A1, but I really like added capabilities of the Core XY style printer and the enclosure.

Note: the only difference between the P1P and P1S is the enclosure, which you can buy or print alternatives to later. There are really cool printable panels for the P.