Know that ANY aftermarket part made for a vehicle has to comply with the specs it's replacing. So, if there is an aftermarket filter, it has to 'in theory' essentially be the same product. The reason aftermarket companies exist is because dealerships could monopolize parts and sell them for whatever price they wanted to because they would have no competition.
That being said, not all parts are created equal. You could have weak rivets or welds, inferior paper filters inside the filters, etc. As for Mobil 1 products, I used them in my 325 hp turboed car and never had a single problem with them. Would I use it in our vehicles? Sure, why not? However, I would personally stick with Mazda IF the price was comparable and the product was easy to obtain which I know it is.
It comes down to personal preference. Some people like piece of mind and are convinced O.E.M. is the best for their vehicle and nothing comes close. Others do a lot of their own research to find out that sometimes there is a better or equally good product for the same $ or less. Either way, you can't go wrong with mazda or mobil 1.