u/Comfortable_Case5322

First time vegetable grower here. growing a few cukes and two Cherokee Purple Tomato plants in grow bags. Each in its own 10-gallon bag.

Ive read all about pruning and such and have been keeping on top of things, but I swear I can’t tell which (or if) of these is a sucker vs the main stem. I swear it seems like the plant just split into two main vines. I did not top the plant, it just grew like this on its own. if I keep both stems, will I need to string up each for support?