It's more of a stylistic difference, at this point. However, if you're planning on doing PvP, I'd suggest using a 1H weapon and a shield, simply so you can Shield Bash and interrupt spell casters.
Things to remember: Bigger weapons generally have higher DPS, especially two-handed weapons. However, smaller weapons have speed - that dagger doesn't do much damage per hit, but it attacks often, which gives it more chances for critical hits and also disrupts spellcasters more.
Speaking as a spellcaster who has been interrupted more than once by a Shield Bash or other stun-effect... =^_^=