"It makes little to no sense to have both a B&M invert and floorless in the same park, as they create the exact same riding experience" (Bolliger&Mabillard)
SFMM has both a Batman inverted, and a floorless (Scream!), and they are located close to each other in the park. To me, the riding experience isn't that similar. In SFMM's case, Batman is more forceful than Scream!, and Scream! has different kinds of inversions.
Eric