That's good info. I did 32kb right now. I do like the idea of it booting quicker if I put a lot of stuff/games on it tho.
If that would make a difference for the switch then I could try 64 instead, though I'm not sure how much space it takes.
I would stick with 32kb, exFAT with 32kb cluster take up more space than NTFS with 4kb cluster when comparing amount space on drive even though you copy the same data to two seperate drives one on exFAT and one on exFAT, for the 3DS you see the benefit as it boot up faster due to the larger cluster but it take more space on the card. Not much benefit on the switch if you just leave your on sleep mode all the time when not in use and plugged in to the charger.












