One thing I keep noticing with guys who like the horizontal is they complain about their backs if using vertical. However, my back is shot....and that is one of the big reasons I go for vertical. By my back being shot, I have scoliosis and have had 3 surgeries on my back. Doctors say I should never lift over 20 pounds the rest of my life. I'll stick to the vertical splitting so I don't have to lift.