Both of you using MDF for shelves - I'd use ply. Less saggy, less heavy, less horrible dust. Takes paint just as well - maybe better on the end grain once sanded.
This. 18mm ply has about the same sag resistance, it looks better, and it weighs less.
Poplar ply is way lighter and normally cheaper than birch, if you can find it.
@bq started
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Both of you using MDF for shelves - I'd use ply. Less saggy, less heavy, less horrible dust. Takes paint just as well - maybe better on the end grain once sanded.