They are two very different fish so its hard to say,
One is a solitary species which is aggressive toward eachother and the other is used to being a group and feel more comfortable and work together in a group.
Both can be active depending on setup and amount of fish but from experience a rbp shoal would be more active and comfortable then a group of macs, although every fish is different so there may be some mac shoals that are comfortable and very active.
Over all I would say a solo mac is more aggressive than an rbp