Xperia 10 does not support aarch64 apps, but are there really any apps that doesn’t also have armv7hl?
I doubt that. There is really no advantage to using most apps in 64 bit mode vs 32.
Similar question answered here already:
The 10 II is the better phone, but a couple of apps are not available in aarch64, it is still the initial software version (with spelling correction missing)… and it is more expensive.
I think it is worth it, but the regular 10 is still a good choice, especially if it is significantly cheaper. Just make sure you don’t bend it.