A couple of years ago I grew two each of every variety of tomato that I grew that year. I talked to many people about leaving or removing suckers and got a different answer from each one so I decided to do a test. Since I had two of each variety I removed the suckers from one of the plants for each variety and left them on the other. I didn't do any sort of scientific analysis but I sure didn't notice any difference between the two mothods. One thing I did notice this last year tho is that the tomato plants that I remove the suckers on are much more managable on the stake.