There is no answer.
But mods which have secondary speed stat are better.
You must read carefully abilities of your characters.
For example,
General Kenobi: He cannot inflict any debuffs to enemies, which means he doesn’t need potency stat. His role is a tank.
So, 23.5% protection primary stat mods might be recommended.
I mods him like this.
Arrow: 23.5% Prot. (9 spd)
Triangle: 23.5% Prot. (14 spd)
Cross: 23.5% Prot. (16 spd)
Circle: 23.5% Prot. (12 spd)
Diamond: (16 spd)
Square: (13 spd)
4 protection primary stat mods with 80 speed.
Because of his role, tenacity and health are also important. And I upgrade them by bonus sets. One Tenacity sets and Two health sets.
I think it’s pretty good.
Another example,
Obi-Wan Kenobi: He is a tank, but he can inflict some debuffs and remove some TM. And also he can taunt.
It means he should use mind trick first then do taunt as possible as he can.
So I’m focusing on Speed and Potency first.
Arrow: 30 spd
Triangle: 23.5% Prot. (9 spd)
Cross: 24% Pot. (10 spd)
Circle: 23.5% Pot. (9 spd)
Diamond: (10 spd)
Square: (10 spd)
Set bonus: Health Pot. Tena.
Well.. I don’t have great speed mods anymore.. So I can’t give him a speed sets.
By this I plus his potency over 40% so now his potency is about 55%.
It could be helpful to use mind trick I guess.
All you need to do is just reading their abilities then choose what stats are the most important for each character.
BB-8 or Hermit Yoda? Their speeds are crucial. So all in for their speed. I make my BB-8’s speed 290. CLS or Raid Han? Damage is important, so give CD CC mod bonus sets with secondary speeds.
Good luck.