What's best is what works with the fish you have and their feeding requirements. Like anthias and maybe others out there specifically with higher metabolisms. Still, feeding less can contribute to lower nitrates and filtering requirements I believe. I've known of many successful tanks that fed every two days. Heck, I've done every three days at times. My fish have also done well with me out of town for 7 days.
"Life may not be the party we hoped for but while we are here we might as well dance!"