50K merc purchase?

Nearing 50K, primary roster includes: Kira, Redeye and Sawbones. Looking at bushwacker, sparks, phantom, or phoenix.

I have: Arty/Kira/Skyhammer/Rhino/Fragger/Nader/Redeye/Vasili/Sawbones/Proxy.

Is there any way to tell how well you do with mercs? I have a lot of mercs but seem to do really well or really poorly with some of them. I get that there are different weapon types and perks, but surely there's a way to tell your baseline K/D. [Planetside 2 refugee, first post here]