I've owned both in 10'. I've had my Pelican 10' for probably 10 years now and won't go back to aluminun. To me, the main advantage of aluminum is it's lighter weight and ability to handle the elements.
That being said I can still load my Pelican in the back of my truck myself and I keep it covered when not in use because the sun can really eat up the plastic over time if not taken care of. After 10 years I've had no issues.
The "pontoon" style boats are MUCH more stable. I can stand up and fish and get in and out without fear of tipping or falling. I can't say that with my experience with aluminum flat bottom boats, especially 10'. I wouldn't say they are "unsinkable" but I feel comfortable enough through experience with big waves that they will stay afloat if filled with water. I would say pricing is comparable also, even in the used market. My Pelican has been on Corpus Christi Bay and Amistad lake when conditions say I probable shouldn't have and it got me back safely. Pontoon boats are not made for waves.
Both can be accessorized and modified to your needs. YouTube has tons of ideas.
Either will get you on the water to fish. I guess it's just personal preference.