They will both kill anything you hit in the vitals, but on a marginal shot I would choose the simmons. If the hit is angled they leave tremendous holes. Simmons leave better blood trails than any other head I have used.
Both are quality product but the terminator will leave a hole and blood trail the same as any other 3 blade head, the simmons will out perform that hands down. Your set up will be fine.LCH

Both are great, but my choice will always be a 3bl., and Terminators are the best out there!

Go with the Simmons! Since we have all agreed that both options will work well, it comes down to which one looks cooler right?  

In all seriousness though, pick one and get it super sharp. Both heads have good reputations and have killed many animals.

I think I'm gonna just skip them altogether and go with this solution:            
     

Actually I'm still undecided.  I am impressed with all the good words about both broadheads and the knowledge of you guys and gals.