The RL FI cleaner is probably the best FI cleaner out there. While it has UCL properties they are not as good as MMO or Lucas. OTOH MMO and Lucas will not clean as well as RL FI cleaner, not by a long shot. They are totally different products.
According to Red Line you can use both their FI cleaner and MMO together without any problems at all. Once I finish up the FI cleaning using RL cleaner I will use it along with MMO as a maint dose. You can also use RL with TCW-3 if you want to. I didn't ask about Lucas since I don't use it, but I'm willing to bet it would work with the Lucas too. HTH