Well, many of my favorites, I haven't grown that much, yet, but I can vouch for the following, for consistent year-after-year hardiness:
* Galapagos Island (the very early, yellow, marble-sized version that I have, which I got from wintersown.org in the fall of 2014)
*
Sweet Orange Cherry (the place I got it just calls it Orange Cherry)
* Early Girl F1
It should be noted that Early Girl F1 changes a lot. The one they sell nowadays isn't the one they sold a little while ago, methinks, and it's changed in the past at least two or three times. Whatever the case, it's always worked out well, when purchased as a plant (it came from the nursury with a mild disease, this year, but it still has produced well anyway). I haven't given growing it from seed a good enough trial, yet, but I do have a seed-grown plant (which had a very late start).