Transfer Oct 2 of 3-day embryo with a hard choice ahead

We have a hard decision to make. Our clinic for some stupid reason froze some of our embryos as singles and some as groups of 3. We have one single left and 2 groups of 3. They’re open to us transferring either 1 or 2 since we already had a failure. My lining is...ok...at 7.3mm with a very clear and defined triple stripe (it has never been more than 8 or less than 7). I’m doing medicated this cycle. And I’m getting kind of desperate for something to work. The problem is if we unfreeze a group of 3 then we will probably end up losing the third through all the unfreezing and refreezing. But obviously transferring 2 may improve our chances which would be amazing since I plan to take a break after this month.