Well, since you gave the option...neither...
I had an XD-40 service, which I have since sold, but man I enjoyed that gun! I decided the 40 service just wasn't what I needed for ipsc production and I'm shooting Limited division now. However, I plan on getting the XD9 Tactical for production class in the future. I really liked that gun...the grip was perfect, high cap, great trigger, and it was really accurate...I'm tearing up a little so I gotta go now...Check it out before you make a decision.