Which battle system do you prefer?

RTB - Real-Time Based

OR

CTB - Conditional Turn Based

If you don't understand, the RTB Battle System features in:

Final Fantasy IV
Final Fantasy V
Final Fantasy VI
Final Fantasy VII
Final Fantasy VIII
Final Fantasy IX
Final Fantasy X-2
Final Fantasy XI Online
Final Fantasy XII
Final Fantasy XIII

The CTB battle system features in:
Final Fantasy I
Final Fantasy II
Final Fantasy III
Final Fantasy X

I'm not sure if RTB features in V and VI, but I think it does, tell me if I'm wrong and I'll correct it.