What should i upgrade?

[Old voidwalker]

So, Sparked runners or massive shockee feet

 

Unrepaired laser cannon or warhammer or rock recoiler

 

And the last, 

Two Supreme cannons on one mech,   or  Supreme cannon + granic Flame

 

 

 

 

 

[Dani]

Massive Shocker Feet, War Hammer or Rock Recoiler depending on your mech, and the last two both suck ass and you should probably have Red Rain 1x/2x and Savagery but I guess it again depends on the mech but I gotta say use Supreme Cannons as place holder till you get RR and Sav.

[OKI DOKI]

hard to tell without showing the inventory. All parts in some ways are good for respective level/rank. The inventory determinate current possibilities to decide what can be best at that particular moment and useful for higher level and personal preference and expectations at the moment.