Wood is more versatile on offense. I won't argue that. And he has been a better shooter outside the no fans years.
However, maxi is a super versatile defender. He can bang with bigs, switch out on guards and wings, hedge, drop, weakside shotblock. Wood can sometimes get highlight blocks but he is an indifferent defender at best.
In a vacuum, I would argue that alone makes Maxi more valuable. However this is the Mavs and you have a goddamn red giant in Luka at the center of your offense. Shot creation out of your bigs is a nice bonus but not something you really need.
Overall, I really like the trade for Dallas. A 3 big rotation of wood/maxi/powell is solid and they all have different roles and can play with each other. But if im closing with one of those 3 or forced to pick just one, its maxi.