Commitment
How long the student is expected to play.
Rentals are a great choice if you're not certain the student will commit to the instrument for more than a few months, or if the student may decide to switch to a different instrument (for example from cello to bass). Rentals allow 6 months of rental credit towards purchase, so you would have up to 6 months to decide about rent vs. purchase without penalty. If you expect them to play for a year or more, purchasing will generally save you money.
