Altmer (high elves)
Argonian
Bosmer (wood elves)
Breton
Dunmer (dark elves)
Imperial
Khajiit
Nord
Orc
Redguard
Ok, so races rather than classes, but different races will be better at some skills than others and have different perks. I just always have massive indecisiveness when I have to pick. You haven't played the game yet so you don't know what will be the best. Very stressful. It's the thing of one choice right at the beginning a game affecting the whole experience.
Maybe it's not such a big deal in Skyrim. I haven't played it yet, so I don't know.
Take Diablo II for example. I played that through with a few different classes, and I found that although say the Necromancer guy was great when there were swarms of small enemies, he struggled with the bosses, and while the paladin wasn't so lekker against the swarms, the bosses went down without him breaking a sweat.
Also, by the sound of Skyrim, it'll take so long to finish with one character, what's the chances of playing it through with a few different characters.
Evil meet my Sword. Sword, meet Evil!
LOL, Ya it's just a little stressful for me because it seems like a big decision, but once I've made up my mind, I sommer play and have fun. I am a sucker for side quests though
EDIT: It's not necessarily about what's the best, but what will suit me the best, and as such be the most fun to play.
I chose Redguard. The guy looked cool and it said something about being the most naturally gifted warrior race. I like to bash the crap out of everything, so that seemed like a good choice.
Corsair Carbide Spec-01, MSI Z97Z SLI Krait ed., Seasonic S12II 520w, Gigabyte Geforce GTX 970, Mushkin Blackline 8gb, i5 4690k, 1 TB
Played a Dark Elf Neverine in Morrowind. Naturally had to do it again in Skyrim. Now if only I could leap ten blocks of buildings in one jump again :/