1. Cost...is cost a factor. The Corelle will be cheaper get and replace.
2. Space, the Mikasa bowls are wide lipped, so they will take up more space than the Corelle.
3. I like the pattern on the Mikasa that will work well from casual to formal, but the Corelle won't.
I take issue with the bowl shape of both, but I prefer a deep, 5-6" diameter bowl, like a good cereal/pasta bowl.
Check out the pattern Cherish and Corelle's site. It is the same shape and color as the Winter Frost White, but it has a pattern on the edge for a bit of umph. It comes in square and round if you like. If you sign up, you can get 20% off your order. It is a popup that came up when I went to their site.
