"A 6* may come and go but a 7* remains forever"- Robert Frost
I don't understand how this can be a hard choice, unless you are in dire need of ISOA seven star is R4+ straight out of the box with just ISO and gold invested, no cats neededA six star will burn so much gold, catalysts and ISO just to get up there, and you actually have to make a decision on if it is worth taking to R4 (most aren't)So you get loads of ISO and a max of 3,300 7 star shards, if all your pulls are max sig and you get more shards from the crystal. So you can have a 7 star or 1/5 of a 7 star with a bunch of ISO to sell