Weaving Fork

I was gifted a beautiful navajo-style loom. I have considerable experience on jack and heddle looms, but have never woven tapestry. Should tines/inch on a weaving fork closely match warp sett (5 notches per inch on my loom)? I'm thinking of ordering a weighted fork, and it's available @ 5.5, 7, 10 & 12 tines/inch. Advice for a tapestry novice?