Wood flexes and would be more prone to leaks. Even some acrylic tanks flexed and burst at the seam of that 90 degree bend. Glass doesn't flex (as much).
Here's a link to someone's acrylic tank that burst.
http://www.ultimatereef.net/forums/s...322764&page=10 (scroll half way down)
Took him a while to get back on track.
http://www.ultimatereef.net/forums/s...322764&page=25 (scroll half way down)