Ares
you mean later stages in dark mode right ? and which stats in atk and def do you think would I need ...
Ah yes.. in Dark mode, Dark dungeon and Infinity tower.
About the stats you need to progress, well it depends on the person.
If you want more attack then for every equipment choose strength and dexterity included for every item. Then intelligence and vitality if you want defense otherwise. You can also choose all but doing so will sacrifice other important stats like critical hits and cooldown duration. You have to decide for yourself.
Or if you mean upgrades with stones to increase attack or defense, then my answer is both. Upgrade all equipment with stones as much as possible.