Which do you think is more effective?
There are so many factors that can influence heart rate. Medications, stress, fatigue, not to mention that the formulas they use to figure MHR are not considered accurate. Research has shown that RPE/Talk test to be just as effective as monitors although, I do feel that monitoring has a place in training.
I love the talk test when a machine or monitor isn’t around. like hiking if you hit a big hill, or in the middle of a circuit.
I usually ask What did you have for breakfast or how did work go today and then count the words they say. That way they don’t know your doing it.
So context determines which one is best.