I prefer and use Balanced Body equipment and have for over 10 years. The quality is exceptional and they continually add new features by listening to their customers. Things like the Jumpus Maximus jumpboard, the infinity footbar and the tower reformer combination. They also incorporate several spring tensions and adjustability so you can fit all shapes and sizes, kids to professional athletes. I couldn’t work without my Balanced Body equipment.
I am a huge fan of SPX Pilates on the Megaformer. I’ve used a modified Balanced Body reformer but it does not have the same bang for your buck as the Megaformer does. I like the STOTT equipment but have more experience on the Balanced Body equipment. So in order of preference: Megaformer, Balanced Body, STOTT.