[healsdata]

We have a mixture of both in our office and I prefer the melamine ones because they seem to have less problems with marker hanging around after being erased. We also have some cheap melamine boards and some nicer ones; I'd recommend spending the money to get nicer ones because the cheap ones also have problems with ink lingering.

However, like the parent said, if you have a use case that requires magnets, porcelain is the way to go.