When to best train glider and power?

Many people suggest a large benefit for student power pilots to fly some
dual in a glider and similarly many parts of successful glider piloting can
be more cost effectively learned in a power plane. As an example, it is
cheaper to do multiple landings in a power plane when learning to land.

Do the instructors here have opinions regarding the advisability of a mixed
curriculum and the best place in the training to fly each type?

Do other pilots have experience or comments?

thanks