They'll both do very well. In fact, the tank in my Dark Armor Sucks video is DA/Fire.
Elec armor will have better resists, less defense, better end management, but less control powers and a worse heal. They both have endurance debuff resistance, but DA has perception bonus and debuff protection. DA lacks KB protection. I like DA's T9 more than I like Elec's.
Dark Armor has a small hole to energy damage. Elec has a small hole to negative energy damage and a gaping hole to toxic. Neither really has to worry about S/L or psionic stuffs.
Again, they'll both do very well. Either pick the one you can come up with the best concept for, or flip a coin.
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The main difference is endurance management. DA is the most endurance intensive primary, while Elec is the most endurance friendly primary. While DA can solve its end issues after IO's, Elec can turn its massive pool of endurance into to an advantage while IO'ing as well.
Other differences include the self heal. DA's self heal thrives on having multiple targets around, while Elec's heal is better when facing a single foe. So against mobs, DA's heal is superior. Against the hard single targets(AV's, GM's), Elec's heal is a bit better.
Both sets have a damage aura, but Elec has a recharge bonus as well, which will make your PBAoE's recharge faster.
Overall both sets are pretty close in overall performance, with DA giving you more survivability, and Elec complementing your offense better. I agree with what Dechs' said in picking whatever suits you more.
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I am torn.
I need some direction on pros and cons.
They seem to have some good synergy but I am still torn.
I have only 1 tank that I stuck with but that was a pre-ED Fire/SS.
I have been mostly a Controller/Dom/Corr type of player.
Help me decide.
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