What is the best node to run at the moment?

[nc50lc]

I'm also assuming that all version of Core will have to be the same release.

It's not a hard requirement.

But there are a couple of latest incompatible releases to watch-out for (I wont mention older compatibility issues):

• If you've used v28.0+ to sync a new blocksdir, those blocks can't be used by your other v27.2 Bitcoin Core instance or older.
  This is due to the new block files being XOR'd.
• Your old legacy wallet.dat files can't be loaded to v30.x anymore with them being migrated into a descriptor wallet.

Other than those, it's relatively safe to use different versions of Bitcoin Core.

[LoyceV]

the WiFi supports Bitcoin.

As a digital nomad without fixed internet, would it be possible to just copy the blockchain from someone you know? Your own Bitcoin Core can verify all blocks afterwards, so you don't need to trust someone. Or just leave a laptop with someone for a few days to sync?
After the initial sync, even my cheap mobile data could keep up with the monthly data requirement.