dueling class?

Tekshadow

What classes are the best at dueling/roaming right now?

Tankqull

there are significant differences between roaming and dueling...

e.g. mobility is a nonissue while dueling but a significant part of the roaming behavior...

mtwiggz

Any class given the proper build and player behind it.

Personally I find dueling on my Magsorc, Magplar and StamDK the most fun. Yet others may prefer other classes.

Mustard

Stamina Templar is the FOTM

Ashamray

Stamina classes are fine and fun for duels.
Magicka sorcs can be fun too, but I find dealing with shields and reflections annoying.
Magicka templars also strong, but healing as only available def and overall clumsiness may be frustratiing.
Magicka DKs are fine too (don't believe mDKs weakness).
Can't say anything about magicka nightblades... I think they have great burst potential but lack sustain damage and survivability.

My personal list for duels:

1. Stamina class. All are great.
2. Magicka sorc.
3. Magicka templar
4. Magicka DK
5. Magicka NB.