It really depends on your setup but a general method is Str Wis Block for Vanguard and Str, Wis, Agi for assualters and support. If you have low crit rate on your assualt/support you can sub out Str/Wis for it depending on what each character uses. I believe it has been proven on another thread that adding Wis refines to a vanguard is better than adding stamina because of the defense buffer against supports and wisdom mains.
If your vanguard is Chad, strength, agility, block, and stamina. For support, crit, wisdom, agility, and hit (agility and wisdom should be the main ones). For main...I think it depends, but agility, strength, crit, and hit. That's what I'm using not sure if vanguard dodges like Yachiru.
Generally, for vanguard i go stamina/block/dodge. for assaulter (I imagine it depends on your assaulter) main dmg attribue(str/wis), hit, crit and for support wis/agi/crit or hit.
These may not be the best, but this is what I'm currently running.
I'm not really sure whether or not certain assaulter can use wis and not sure if any supports use str.