My upside down are heirlooms, Cheerokee Purple, Brandywine, and German Johnson, I believe those are all indeterminates. I have a variety conventionally planted... Heirlooms to match the hangers, Romas, Yellow pear, Celebrity, Orange Jubilee, Beefsteaks, etc. They all started the same size. The hangers are in a mix of moisture control potting soil and compost, which may be the advantage over my soil. The stems on the hangers seem to be stronger than normally grown tomatos. I surmise due to the fight with gravity.
I'll post pics