if something works like vigor, then it should be easier to maintain than pride (especially in short fights). we don't have Vigor yet, but i can already tell it could possibly be worth it more than pride cause you want to end fights as fast as possible, and vigor greatly helps to that...
with vigor, we're talking 30% assault at the start of fights at lv20... and more when some stuff can go FLB... now imagine a grid full of vigor... you'll have at the very least 100% assault, but the start of the fight, 300%...
pride on the other hand benefits from longer fights, as it gets harder to maintain your HP as the fight goes on (unless you're super tanky like my wind team's def setup). with more trigger attacks appearing from bosses (and later on, regular/mid-boss enemies), it's just gonna become a downhill fight if you're just relying on just a healer and atk debuffs to keep you alive (maybe a tank can do it too). unless you can outheal the damage you take, that pride will eventually kick in, but as a reminder to quickly finish the fight before you start losing people.
granted, something that uses both can easily maintain a decent bonus, but far as I can tell.... Vigor > Pride.
either way, we kinda do need some eidolons (possibly hime cause some abilities like thor's self heal works like it) that work like vigor/pride cause they're likely to have some high level increases (100%+ for gacha ones, 50%+ for event ones). there are event ones that do it later on from what i can tell (i think Fluerty is one of them)
except this isn't a Q&A thing... this is discussing later hime and eidolons that come out... or their changes like summer sol's recent DMM buffs...