I don't have any friends who have a level 100 drakon and readily available to do my tests for me... but I don't want to regret any decisions and the wiki's only covers the base.
I want the decision based solely on how useful it is on speed running fsc.
Scorching Barrier vs Backfire Barrier
I'd like someone to solo Vana and do what I did, to test the difference between two fireballs and three. I did this back while I was level 80 something, so 20 more levels oughta be different but I'm not there yet. The test is to solo Vana and get to the mask phase, using no blitz and barrier only. Obviously the backfire barrier won't be too different, but the scorching barrier might provide more dps. My level 80 test was like... 61 damage with 6 ticks = around 366 damage. That's like... one, two sword hits? 68 if poison. It was with no blitz, so the fireballs are likely to hit less when mask is up.
Backfire Barrier sounds nice too. I mean. Swift shoes II with this, I'd imagine it'd be fun even if really short. If the barrier's dps is too low, I'll go for this. Charge attacks are better than barriers anyway in matters of dps.
Also, would anyone happen to know if frenzied firestorm works at all with Vana? I'd rather have someone test it for me and be very sure, then have someone guess it's not. I mean, hey. I thought my barrier would set the mask on fire.
Maybe those two slags? In a team, would it be worth it?
My pal Xenon-Sntax and I have both barriers and I can tell you my general opinion on the two.
It seems you're gonna use this barrier mainly for the purpose of adding damage in a short amount of time (Burst Damage). I have the Backfire Barrier and it doesn't affect the damage in any way from the normal barrier. My friend Xenon has the Scorching Barrier and although I do not have the numbers (I'll edit this later) I can attest that the damage was slightly decreased per tick.
*Now this is the important part*
You are gonna use this on Vana's mask, which becomes stationary upon dousing. Now the thing is, if you time your movement with the spinning of the orbs, you can keep the orbs in contact. However, you're using a Blitz, so at times you will be stationary. The question will be, how fast is your CTR? Cause if you can go full auto you'll be stuck in place and should use the Scorching Barrier, if you're gonna have a couple seconds to skirt the mask, you can develop the skill to get more powerful ticks. I'll have to do some math later to see how well this compares. It would seem that Scorching Barrier is probably the best if the 1 second of move bonus isn't attractive to you. (I kinda wish it was 2 seconds...but that's another issue).
Frenzied Firestorm gives you a bonus for every monster caught in the blaze...in fact I'll stop there, just use the Barrier.