Hi, DNWA,
Of course, personal considerations override everything else - a personal connection to RB; the RBI being the first watch that piqued your interest in AP; etc.
But on the basis of the watch alone, the Montoya started the "evolution" of the ROOS that has resulted in the RBII, the Grand Prix, and even, arguably, the Survivor.
I do like the dial of the RBI, but I tend to prefer "special editions" to be a bit more than a unique dial with different colors or fonts.
JMHO.
TM