Doesn’t really matter imo. Internally maybe slightly faster, maybe some games require internal, but i run games on my external, loading may go slower unless you have a nice chunk of ram.
Seed
What do you mean by safer? Both can be dangerous if it executes code. If you mean getting caught torrenting leaks your ip address (hence why people use vpn)
If you dont want to spend money there is i2p, set up an i2p router, configure a browser to use it, http://2.postman.i2p is a tracker there, just paste the magnet into i2psnark, no vpn required.