You have to do what is most comfortable for you both - by that I mean physically, psychologically/emotionally, and financially. I would say IVF probably gives you slightly better odds. 3 IVF's is tough. My GYN this week reminded me to make a plan and stick to it with fertility treatments. This is a tough call to say after three rounds of meds, we will quit - but what if you don't go to retrieval. So they you say 3 IVF's, with one CP on the last one. Then you say what if we do it one more time. I think it is hard to set bounderies from the beginning - but after awhile when you feel you have tried all you will either be BFP or know when to move on.