I recently started to use TrainingPeaks for my planning. I noticed that the HR and power zones are quite different from those of Sufferfest.
For example, my zone 2 with SUF is 127-154, in TP this is 148-160. Both are based on the same threshold, but they barely overlap. Which model do I choose? As I work with a polarized training model, getting my zone 2 right is quite important