FET estrogen injections or suppository?

Just wonder what type of estrogen you ladies have used for FET the vaginal suppository or IM injections? The first time I did a FET (which was unsuccessful) I did the injections and the estrogen stayed elevated in my system for months after which delayed starting treatment again. I just had my retrieval last week and are waiting for pgs results then will start meds for FET ( start bcp tomorrow). the Doctor wants to use suppositories this time instead so my levels don't stay elevated for so long if it's not successful, but is that equal in success rates to the injections? What has anyone had success with?