If your pre and amp are balaced CKT, use XLR cable.
You will find gain is ~3 dB higher, i.e. louder at the same preamp vol. position.
The bass is tighter and high has better resolution, and the sound is overall "cleaner".
It does sound better, not just impress any friend, if it is really balanced CKT.
If your amp's are not balanced CKT, they probably sound about the same in RCA or XLR. In this case, RCA is usually cheaper cable.
You will find gain is ~3 dB higher, i.e. louder at the same preamp vol. position.
The bass is tighter and high has better resolution, and the sound is overall "cleaner".
It does sound better, not just impress any friend, if it is really balanced CKT.
If your amp's are not balanced CKT, they probably sound about the same in RCA or XLR. In this case, RCA is usually cheaper cable.