Enchanter, because their overpowered -- not so much because of class synergy. Enchanters would be extremely overpowered soloers if it weren't for the 50% penality they get in exp if their pet does over half the dmg. This is removed for duos. So Enchanter/anything that can work with them at all (including necro) are the best duos IMO.
Edited for clarity
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