Too many differences to compare the two. I think you should decide what you want the gun for, in terms of conceal-ability. If your line of thought is the smaller the better, then you have the right gun. If you decide you want a larger round, than the 709 is the choice. Now if you are talking dollars, the TCP is less expensive. I have both and the wife likes the feel of the TCP and I like the 709, so that is another area to look at - how well does it fit your hand and how does it feel. Both are great guns and you can't go wrong with either one. If I were you, and since you already have the TCP, keep it and start looking for a 709. Best of both worlds, in my opinion.