I have never not pulled on a 25mythril pull. 
I  had 90mythril but for the last two days, I've been on a tear doing the dailies. Not sure why when a fest is around the corner, but I did raise 3-4 5star abilities already. So perhaps I'm just getting a headstart on orbfest. 
That being said, I'm going to go look at the banners again and probably either update this or post a new message, but I think I have a few on each banner, so I may need some advice on dupe-danger. 
Also thinking about going really hard with the mythril on all the orbs. The majority of my 5star abilities are at 4uses. I have some exceptions like Meteor, Ultra Cure, and I don't know, 3-4 other important ones, but my chaingas need to go up, and my Multi and Full breaks would go alot further on long fights if I could use more than 4 times. 
As an aside, you know how they could/should fix the 5star summons? Just make them all 3 hits. I think that'd still be balanced vs the max of 5 uses. 
Well, brb, going to go look at the fest banners, and the other ones that were posted after it.
Edit:
Banner 1 - 1/12 - I'd really like Yuna's USB, and Yuffie's looks great too. Don't much care about anything else on it, but I'm 1/12 - probably pull. 
Banner 2 - 4/12 - Tifa's USB doesn't look too bad. I'd like to have Eiko's USB. Probably should skip though. 
Banner 3 - 3/12 - Don't really see anything I want. I already have Raijin Last stand and Rapha's awesome burst. Should skip this. 
Banner 4 - 7/12 - I guess I'm skipping this. I thought I read on Reddit it was suppose to be the best banner too. Kinda bummed on that. 
Banner 5 - 2/12 - Oh shit! Is that SG?!?!?! My first real chance at Wall again? Oh man. I need to pull on that. 
So looks like Banner 1 and 5, maybe banner 2 for Tifa and Eiko.
Edit2 -  Lucky Banners
Imperil - 7/30 - Nothing real awesome but could use imperial bio, earth, and.. ice. 
Medica - 6/22 - Don't need any medicas. I guess a chance at Eiko USB.
Lucky 3 - 29/170 - I uh. I guess it would be smart to pull here.