Different person chiming in. I like to start with a small bite just enough to have a hole for the juice to come out. From there I squeeze it a little and just suck out the juice. Sometimes I leave just enough to not have a completely dry tomato. I feel like the juice adds to the flavor. Nine times out of ten that’s enough to not make a mess. For the really juicy ones though there’s still plenty of juice in he second half of the tomato. So I bite just a bit, suck out some juice, then finish the bite. Like some sort of weird tomato vampire.
Normally I eat a tomato with a little salt sprinkled on each bite. After that first nibble though I pour a good amount of salt on before I suck out the juice. That way the ratio a tomato taste to salt remains yummy. I’ve also tried tajin instead of salt. Its different. Not bad mind you but I’d say more of a once in awhile combination just to change it up from the reliable tomato and salt combo.