What monsters best exp?

1- What is the best monster combination available for a monster/medic?
2- What is the best monster combination for experience at my levels-
Loaded monster level 8.
Monster Points level 15.
Health bonus- 4
intelligence -7
Max advanced DR
Level 1 regen

this can vary depending on maps , I'm a huge fan of Brutes/Behemoths
but different maps require more moving making Brutes (without max health/regen/intel) easy targets
the Skaarj trooper are very versatile and very hardy
Elite merccenaries are very effective
I'd say go with two of the most powerful monsters you can get and fill the third slot with whatever you can