Don't hold me to this, but I think the prices are basically the same except that Re-Tail has an item of the day you can sell for a bonus. Also, obviously, there's the Flea Market feature you can use to set up selling stuff to visitors if you get any truly rare items you'd like to part with.
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Re-Tail purchases your goods for a higher price, so sell everything to them. Nookling Junction will upgrade just like Nook's Cranny, and will eventually become a 3 floor store. The first upgrade will introduce the catalog for re-ordering items.
Sucking at something is the first step to becoming sort of good at something. FC: 2020-0946-8183; PM me to add. Registered AC Time Traveler.