I would also go for the wooden option.
Particularly if you want to heat it at all, even occasionally.
I remember Capo struggling with his old concrete sectional garage. He had a seemingly never-ending plan to insulate it and install a dehumidifier system ... which he never got round to.
The other advantage of wood is that it is much easier to attach things to it ... shelves, cupboards etc or even just a nail to hang something from.
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