There is no best, just depends on what you want.
Since the AoE nerf, i've moved away from fire builds, and went into air/earth, and when running in groups, i go as pure elementalist, with monk for rebirth only.
Solo, especially farming, monk provides some nice energy supply skills (essence bond or balthazar's spirit).
Mesmer secondary can help going against casters, there exist some really nice anti-caster or caster resistant builds, or at the very least, using echo for nuking.
Necro has some nice skills as well, and i always found that some of necro spells are quite energy intensive, so having elementalist can be an advantage.
Even ranger secondary can come handy (serpent's quickness).
Warrior for stances (anti-kd/energy supply).
There just is no best secondary, take a look at what you want to do, then find the most suitable secondary. It doesn't really take much effort to change.
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