Damn...I don't know, I really want to say this is a good fight that could go either way. But I kinda think the soldiers get straight up demolished. But off the top of my head, I can think of some feats from cap that even the Turtles might have a hard time replicating.
There is a couple from Civil War coming up like him kicking either a jeep or maybe even armored vehicle so hard that the entire front end moves almost a foot over. Doing that to a car is one thing, bout tonwatch it again but if it was an armored up humvee then there is a good chance he might kick thru a turtle shell. Something comic spidey should be doing, not cap.
Winter Soldiers arm. Unless IM was downgraded, its strong enough to also punch thru shell.
I really wanna debate for Ninjas>>soldiers but some of those feats are hard to get past.