Sunlu S4 or multiple smaller dryers for flexibility?

The basic question, if I want flexibility to dry multiple types of filament at the same time, would I be better off to get multiple 1 or 2-roll dryers instead of the Sunlu S4? I’m guessing with the S4, you can only dry one type at one time?

I.e., wanting to dry a roll of PLA and PETG, or even ABS, at the same time? It’s one big chamber in the S4, so if I set it for ABS then it would melt any PLA, correct?

Multiple dryers…I have 1 for each printer…it’s easier that way…JMO

EDIT: Once you have a dryer, print all your spools & filament clips in PETG.

I ended up getting a pair of Creality Space Pi Pluses. There was a seller on Amazon who sold a pair for $125 as a Black Friday deal, so even saved $5 over the S4 Black Friday sale price.