Both are good. Flamethrower is a cone whereas Ignite is a small targetted AoE. If you don't have anything to immobilise an enemy, I wouldn't really recommend Ignite, as they will just simply move out of it.
Though saying that it's great for blocking doorways and has a very cool recharge and accuracy bonus. It also deals more damage then Flamethrower.
Flmaethrower's good and is complemented by Full Auto. Careful of Agro though.
Considering Sin_Harvest's Avatar they must know what they're talking about! 
Hehe I just noticed that now!
Considering Sin's number of deaths per mission I wouldn't count on it! 
[j/k Sin hehe ]
If you team with a dominator a lot-ignite
If you solo, flamethrower.
I think ignite does more damage, especially now that it is buffable in i7, it should prove to be VERY powerful when teamed with a dominator.
I would go ignite and always get a dominator on team.
Fire/fire dominator + AR/kinetics= serious ownage in i7 PvE.
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Considering Sin's number of deaths per mission I wouldn't count on it!
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It's been reduced from double figures now! It's an improvement!
Which is the best AR flame power Ignite or Flame Thrower?
I initially skipped over Flamer thrower due to advice from a previous AR player but was planning on taking Ignite, is this a wise choice or should I take both and find something else to dump?