Im afraid your going to get a wide range of answers on this one. I think both strive for "realistic" and "historically correct", but at the core the philosphy behind what the game should be is a bit different, and both are directed at a different crowd.
RFB is directed more at the ultra realism crowd. Where as TMaru is directed at the crowd who like realism, but not at the expense of exciting or varied gameplay. The biggest difference between the two mods (although i really havent looked at RFB to be honest), is the campaign game, and the AI. Tmaru's campaign assigments is deliberatly set to be varied and active, the AI more challenging.
Which one to play, really depends on what you want out of the game.
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