Hi and welcome coffeebucks, nice to have you with us :)
Irene's right, it would be better to sell the authentic ones as compared to the generic accessories. But this may depend on the market you want to cater to, there may be people who want to buy Apple accessories but others may also prefer the non-branded ones that work just as well.
Personally, I think your profit would depend greatly on how you market your products whether you decide to sell authentic Apple accessories or go for the generic ones. Just be sure that you are selling compatible non-branded accessories and not copies/fakes. You have to be sure about this as you might end up compromising your business. Be wary when you deal with Chinese suppliers, avoid any products that have a logo or name or anything of the slightest that may denote the product is "Apple" (this goes for any other product brand).
Here are a few suppliers that may have the products you are interested in -
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All the best :)