I'd say each to their own.
berserker; Cool for people who like to be in the thick of things. If you play on expert or above, I recommend light armor as tanking is suicide and the light armor will be a nice bonus to maneuverability.
mage; Very different plays-styles in this one. You can be a sneaky illusionist or a conjurer/necromancer who lets other fight for him. Just for Satakal's sake don't use destruction! It WILL get you killed. This is generally for people who don't want to fight directly.
1h+shield; This is a fun and balanced play-style, where you will often have to think about how you approach stronger enemies and will require some tactics, so I suppose it's for your inner strategist. Again, I recommend light armor for the same reasons.
I think you should pick whichever suits you as a person, but I'd say try them all out and see which you like.
Also, come up with a cool back-story and see which one best fits it.