I have the 230's if it helps at all. I found OGC was too "smooth" for what I wanted and pushed sand away from the ends of the tank. LTC was pretty nice. I ended up setting each one to random up to 60% in a 48x18 tank.
I also tested those modes and wasn't of my like. Ended with 1 in Random and the other one in Pulse. Great movement all around the tank on my 6' 125 gallon. max at 75%.