Seed from grafted plants of avocado

Hi, i visited different stores in peru looking for avocado plants . The problem is that all stores sell grafted plants of avocado. In one store the seller told me if i want a plant of avocado not grafted i just need to buy one avocado and plant the seed, but then i realized that most of the avocados fruits that sell in the market comes from grafted plants.

So i was wondering: is there any difference if i plant a seed from an non graftef avocado vs a seed of a grafted avocado?

Is there any difference ? Which are those?

Do you recommend to plant from a seed of a grafted avocado fruit?