There is nothing wrong with commercial cultivars as long as they are region specific. The majority of fruit trees readily available are commercial cultivars.
I must reiterate - the fruit trees available at Lowe's, Home Depot, WalMart, K Mart - any and all national big box stores - are NOT region specific. The nursery stock is ordered by buyers sitting in the home office. They have NO horticulture knowledge. Their sole purpose is to make the best deal they can get with growers. They are idiots.
I do shop Lowe's because I know the growers. As I stated in my previous post Citrus trees are a great deal because the grower is in Belle Chase Louisiana. He has a 5 star reputation. His citrus trees are the best. I would not purchase any other fruit trees from Lowe's.
When I worked as a Nursery Specialist for Lowe's I was appalled at the lack of knowledge of the buyers. I sent list of fruit tree varieties suitable for Louisiana gathered from the LSU Ag Center. I BEGGED the buyer to find a grower that could provide region specific cultivars. That idiot laughed at me. His told me that he could care less if the trees ever produced fruit. As long as the tree lived for 1 year it was good on his book. That is when I requested a transfer to another department. I was hired because I had the knowledge and experience to run a nursery. Unfortunately I was not allowed to use that knowledge and experience.
DO NOT BUY FRUIT TREES FROM BIG BOX STORES!!@@
I posted a link for you from Purdue University. It is extensive and provides you with the information you need to make intelligent choices.
Sorry for the rant. I get PO'ed when it comes to big box fruit trees. I am too passionate about regional suitability.