I don't think anyone can make the decision for you, dusty.

However, if I were in that position, I think I'd transfer them both. Sure, there is a chance of twins, but there's still also a chance that only one (or sadly neither, but I sincerely hope not!) will work.

There's also the chance that if you transfer one and freeze the other to use later it may not survive thawing.

You could grow to blastocyst, but I went from 12 to 4 when we did that, so again it's something that I would be reluctant to do if I were in your position.

I don't want to seem to be telling you what to do, I'm just saying that it's what I'd do if I were in your position. I hope it is helpful.

BW