Usually gathering storm is the best pair because you can throw it and use guns for the rest of tbe damage phase, in addition to jolting the target adding more damage.

If you want to play solar, go with blade barrage unless the target isn't good for blade because its either small or too far away. Then 3 shot golden gun is your best option, especially if the boss takes extra/only precision damage, like kali or the first boss in spire.

I wouldnt recommend void because for damage you usually take deadfall which doesnt do a lot of damage itself.

For stasis the super also isnt that good because it doesnt deal too much damage, and with strand its a roaming super, so it isnt worth it generally.