Go with what YOU like best. Fluting is an option that has both aesthetic and functional appeal, although the funtional benefits are limited. Yes, flutes do aid in cooling and make the barrel stiffer than a non-fluted barrel of EQUAL WEIGHT, but I honestly doubt that accelerated cooling and increased stiffness make a big deal for most shooters.
Personally, I think fluted barrels look great. I have the Bushmaster Modular Carbine with their fluted barrel and I routinely get positive comments from onlookers at the range.