Tomato Suggestion for my Sister-in-Law; Something similar to Campari

I offered to help, and now I am stumped. S-I-L lives in Austin (Texas) and wants to plant a small tomato in a 5 or 7-gallon fabric grow bag on her SW-facing, third-floor balcony. She’s looking for something with a taste and texture similar to Campari. She asked me for advice, since I’m the “tomato guy” in the family, and I’m coming up blank. Not sure I have ever eaten a Campari tomato.

Background: Last year about this time (early March) I drove down there and planted a Baby Boomer hybrid cherry tomato for her and my brother. It grew well and produced a lot. She, however, found it a bit too tart. Campari tomatoes from the grocery store are her favorites. The Central Texas growing season is now. No time to start seeds. She wants to buy a seedling or young plant locally. It needs to be fairly bulletproof, suitable for a casual grower.  

Thanks for your ideas!

In case you aren't familiar with Campari: https://www.sunsetgrown.com/our-produce/tomatoes/campari/