I just went through this myself not long ago:
https://forum.tinboats.net/viewtopic.php?f=3&t=31729
Fwiw, I bought a Lowe 1457. Now, when I bought it last year, my family had a LOT of fun on it. My kids were 4 and 6 at the time (my 4 yr old being quite small), and we were all able to fit nicely.
Fast fwd one year, my kids are now 7 and 5, and have gone through large growth spurts. We were crowded in the boat this summer, and with the kids being that much older and more active/vocal, tempers flared due to lack of room, and made some days on the water... a little testy. When the fishing wasnt fast, the lack of space amplified the kids' boredom, and things spun out from there.
So now, after only owning the boat for a little more than a year, we're looking to upgrade in size.
14' is not really the issue, but width; my 1457 has a 57" beam, which means that the width at the floor, well, it sucks. We are looking to move to at *least* a 64" beam boat, preferrably a 68-70", with a square chine. I also want parallel rear seats and a middle walk-through bench, with a floor. If I can find a 16' boat for a good price I'll consider it, but at this point, width and floor plan/space is where its at for us.
Many jon boats would fit the bill, but I dont want a jon, as I live in a coastal city, and I need something that can deal with ocean waves. Riding in my buddy's 1548 G3 jon is like someone is standing there, kicking you in the arse in the mildest chop - no thanks.
Another aspect, is that we put our boat (only 150lbs) on top of my truck (4Runner) when we do our day trips to lakes near where we camp. The upside is that the logging roads dont affect me like they do the guys who trailer their boats, but putting it up on the truck, taking it down, gearing it up, gearing it down is tedious as anything after about the second day. So, with that said, I bought an old trailer, which I'm hoping will help ease the work.
Anyhow, just thought I'd share my experience with you, since I'm not that much further down the road than you are...