A Wholesale Customer is someone who enjoys full wholesale pricing (25% off), their own account dashboard, and all the perks and free products possibilities that come with being a doTERRA member. However, a wholesale customer can NOT receive compensation or commissions for sharing doTERRA products with others.
A Wellness Advocate has the same discount and perks as a wholesale customer. The difference is that a Wellness Advocate has the possibility of sharing oils with others and earning an income.
One is not necessarily better than the other, it just depends on what you are interested in. If you are not sure, I suggest starting as a Wholesale Customer, as you can always upgrade (for FREE!) to a Wellness Advocate later.