when i had a house and garden, i had a pitch fork, (heavy wire like tines) and a garden fork, (flat 1 inch wide or so tines. (both had 4 or 5 total).

the pitch fork was for pitching (ie, throwing) light weight material (e.g. piles of leaves into the compost pile) someplace.

the garden form is for digging into soil. (i had raised beds, and they got turned gently in the fall with a garden fork. they also can be used to dig potatoes.)

i think anyone who garden's knows the difference.