I prefer immunity
15% on tanker's part doesn't do much unless it's large amount of damage taken, and even then 15% is still not a lot
If it was large amounts of damage, you'd most likely be dead and tanker won't do much.
Let's have a theoretical scenario:
An enemy Hyper Guest comes towards you, and hugs you throughout the scenario, dealing 20 damage per second.
This means that a player theoretically would be dead in 5 seconds, assuming there is nothing else interfering.
Legendary Tanker would reduce the damage to 17hp per second, meaning you'd be dead in 6 seconds instead.
Legendary Immunity gives you a 1/5 chance to mitigate that damage to zero, which, since a guest kills you in five hits, guarantees at least one hit mitigated.
If you're lucky enough and hit the 20% chance more, you might be able to hug a Hyper Guest for 7-9 seconds on end.
Of course, having more time to escape OR kill the enemy would be very beneficial to your survival.
As opposed to Tanker's guaranteed death in 6s, taking your luck on Immunity for more seconds would be better for you, if you really have to kill that enemy.
Fundamentally everyone would take Immunity at first glance, it has 20% while Tanker only has 15%
Immunity would mitigate more damage than Tanker ever will.
I liked the explanation and it has logic. Actually i have Tanker in my fusion coil and now i''m waiting for obtain Inmunity and initially i was suspecting that Tanker didn't help me to much.
No problem, Immunity does very rarely come by in the Gachapon though.
Try to save up until Legendary tier orbs, it'll be worth it!
Immunity is better for me, on the Pizza. You wouldn't be eating pizza in front of enemies as the damage reduction on the Tanker orb doesn't really matter. Immunity is able to get you out of hairy situations, by canceling out one of enemy's hits, while Tanker only reduces it.
Ever heard of Guests, or Noobs? Yeah, they hurt. You have more chances of outliving them by eating Pizza constantly with Immunity orb rather than a Tanker orb, because they stack damage so easily, and most of the time, you are getting swarmed, unless if you are on high ground.
What do you think?