I don't know, it gives you a different... energy.

[ He looks like he's not sure that's the word he's looking for, but he moves on with a shrug. ]

It's not bad. I'm just more used to the neat look you keep all the time. Both suit you in different ways.

[ What he means is that both look good on him, but even the faintest of beards definitely gives off the impression Spock isn't quite himself. ]