I like Stott principles but I don't like Moira Stott's instruction - it's very good but it puts me to sleep. Not because it;s dry, but because she has such a soft voice and she like this soft piano music for her background music...
I like just one or two of Mari Winsor and mostly for the beautiful form of her exercisers than enything else. Advanced Body Slimming would be my perfect Pilates workout if it was just a tad slower, she's repping it out so fast!
I like "strong" but true to the form Pilates - Hilary Burnett and Lara Hudson. I also like Pilates On Fifth workouts and I have several of them from UltimatePilatesWorkouts.com. Corp sisters are really great for spicing things up while still retaining great form.
Jennifer Kries was my first ever Pilates instructor, I think she's very good but I don't really do her workouts anymore apart from her excellent Abs segment from Target Specifics. Possibly the best short Pilates workout I have, up there together with Lara Hudson's Abs from 10MS Pilates.
I admire Ana Caban but I don't click with her somehow. I kept some of her workouts if I ever do.
I don't consider Ellen to be true Pilates authority so she's not on my list