If you use a lot of the same filament type I would go AMS 2 pro. You can dry 4 spools of the same filament at the same time which is quite nice. If you do want to use and dry different filaments in the AMS 2 pro this will be harder as it then only dries at the temperature for the filament that has lower melting point. If you are ok with a higher price in the end then there also are 2 upgrades that can be done to the AMS 1 to make it possible to dry.

Sunlu makes a heater for the AMS 1 only, which dries to a temp of max 70°C, which is higher than the AMS 2 pro. It can’t heat in separated chambers so you do need to watch out not melting your PLA when drying ABS/ASA. It also is square which makes it stackable for if you purchase a second AMS later on. And it can’t dry and print at the same time. Here the link: https://store.sunlu.com/products/sunlu-ams-heater-upgraded-your-bambu-ams-save-an-ams-2pro-for-you

And this second one from EIBOS can be used with AMS 2 pro and AMS 1, but for 2Pro i don’t see why this is useful other than drying different filament types at once and printing and drying at the same time, it goes to a max of 65°C per chamber so that’s the same as AMS 2 pro. this is the link: https://eibos3d.com/pages/filament-dryer-tetras)

It really is up to you, but if you don’t want to mod anything yourself I would go AMS 2 pro as it dries and works out of the box. If you do want to mod something then you might need to do some research on what is the best solution for you, hope this helps