Hi Susie,
In my limited experience of one season of growing out 19 trees from cuttings..I have to say in the end you can never tell. Hardiness is genetics and some adaptation or climatization. Speed of growth is tricky, some just start growing when they are ready to grow. Others that grew fast in the begining will sometimes grow great and then stop and take a rest for some unkown reason and in that time frame the slower growers catch up. The trees of all different varieties that I kept for myself are all relatively the same size, yes some are a little bigger and have thicker caliber but in general there isn't a ton of difference. Others that were slower to get started and were give aways, still grew about the same rate once they were happy and got going. For me, the point of happiness for my trees was once they were outside, hardened off to full sun, and in a pot that was ~3Qt/Ltrs or larger and actively growing.
With all said, the first one growing will likely be your baby. Congratulations, it's a girl!