Stability is certainly a key factor when considering any boat, glass or aluminum. However, having owned both, I'd much rather pull and run with an aluminum boat than a glass one. Also, the upkeep on an aluminum boat is very minimal as opposed to the constant care of a quality glass boat that should be wiped down after each use.

That being said, the best boat I've fished from so far is an aluminum G3 HP, 18ft, with a Yamaha 115 4-stroke. Very stable boat and very fast. I have also owned Bass-Trackers too, and there's no comparison to the G3 that I get to fish out of from time to time. The Bass-Tracker wasn't nearly as stable, which made me consider going back to glass boats too until I fished from the G3. I know there are others out there with the same beam deminsions, but G3 or others like them with wide beams are great boats. Also, you can't beat a good 4-stroke for gas efficiency and dependability. Very quiet too.

Anyway, I still prefer aluminum to glass with the information above in mind. Hope this helps.