Homerk saidI'd go for any male instructor-led group exercise any day. Female instructors love or unconsciously modify moves to be dance-inspired which many men like me that are not that coordinated find then hard to imitate.
I've also just started taking Pilates and one day a male instructor subbed and the women HATED him because he made them perform more bodyweight exercises, unlike their regular female instructor who incorporated a lot of dance moves and kegel-like moves squeezing flexible rings between their knees ala Suzanne Somers "Thighmaster." A week later my kegel theory was confirmed by the news which likened those Pilates exercises to kegels. Such a surprise!
Though one thing I've noticed about yoga - in the 'burbs, I'm the only one in any class, male or female, that "goes low," actually striking warrior poses with my thigh parallel to the floor at a 90 degree angle to my calf. Everyone else, including surprisingly lean athletic men, takes it easy stopping at a 45 degree angle so they can hold their poses longer, which I confirmed with the instructor afterwards is the exactly wrong thing to do (better to push yourself even if you break form sooner). This is the same even in the vinyasa classes which draws more male participants. Of course, in the city, where the average yoga devotee is a 23 year old 95 lb female doing handstands and backflips I'm no big deal. Though I am out here, despite a yoga absence of several years!