You know: actually 64-bit can be attractive only if you need to use more than 4 GB of memory. If you have less than 4 GB (which isn't the case), it may still sound attractive if you're going to do calculations on incredibly large numbers (say: you want to calculate distances between the stars directly in kilometers/miles, instead of in „light years” ;). 64-bit OS doesn't offer any speed gains only for the sake of its „higher bitness”.
In every other „use case” 32-bit system is better, being less resource-hungry. If you mean applications — well, in the Linux world they usually are available equally as 32-bit or 64-bit packages. In the worst case you'll still be able to compile them on your own.
P.S. And „last, but not least” — ARM32 assembly language is so much nicer than the variant for AArch64… they crippled it because of „lack of command space” in 64-bit variant.