I use what ever they are selling at my local nursery. Big Boy, Better Boy, Heat Wave, Roma. But I am partial to Super Bush a stocky patio type that only grows about four feet by maturity. And they can be grown in the 2-liter systems or the gallon drip systems.
I am sure if I ordered the expressive real hydroponic
seeds I would get higher yields but first I got to finish my greenhouse as soon as this cold weather is over. We have had more freezes this year than in the last 5 years.