@Luana130 Personally I'd use an oven and not use a microwave at all, never had one in my life. If you have a lot of guests from your own country, and most like to cook, I'd go with the oven, but you know your target market better than we do. I can't agree with those who suggested a toaster oven- if someone likes to prepare nice dinners, they aren't going to roast a chicken in a toaster oven. Toaster ovens are for making things like grilled cheese sandwiches, which you can just as easily do in a pan on the stovetop.
I've never seen a toaster oven in a Mexican home, do people use those in Brazil, Luana?