I have a topped auto blue mystic. I didn't do it by choice but everything worked out. I have 2 main colas and 4 smaller ones. This is the first one that's gotten this far so I don't really have anything to compare to. I would suggest LST though If you don't have a lot of space. It also helps distribute the light. Mine is also LST'd.
Why thank you . Her leaves are fucked but the buds look delicious haha. Let me make this clear though. I did NOT say it was a good idea. The topping wasn't by choice. I don't have any other grow to compare to. If you have 2 plants, you could run a little experiment. LST, on the other hand can improve any crop.
I hate topping plants I love just 1 head sometimes it can be annoying I lost one of my heads once and lost a lot of bud. I love just regular non-topped plants.