As both products are good,order the
_______ one from the_______ competent of the two clerks.
cheaper, more
cheapest, most
cheaper, most
cheapest more
When comparing two things or two people, use -er or more.
Both of your comparisons in this sentence require the comparative form of the adjectives since the words "both" and "two" indicate comparison of two (not three or four or ... ) things or people.
=)