Been fishing Lake Ontario frequently since 1985. Started out with a 14 foot aluminum StarCraft. That changed pretty quick, as that lake sure can kick up some. Bought a new 20 foot Sea Nymph Great Lake Special in 1986, also aluminum. Deep V and lots of freeboard, it is really a good rough water boat, even though it is also aluminum. That boat got me back in on some pretty scary days. When I retired, I treated myself to a 23 foot Pro-Line cuddy, also a nice boat.
Couple thoughts - Used boats on the great lakes are a buyers market, so shop around. Look for a deep vee, and high sides (freeboard). It helps in rough water. Walk around cuddy's have a little less room inside, but are nice when you want to access the bow for sun bathing, setting an anchor, etc. Look for a stand up canvas, it helps with the wind, spray, and cold. Condition is important, and a well maintained boat is a reliable boat. To much to go into here, but if you are not sure what you are looking at, plenty of marinas will inspect a boat for you for relatively little money. You can save a lot if you find a boat already equipped with a sonar, GPS, radio, downriggers, and a USCG compliant kit, compared to having to buy them new. Most all boats have some wood in them, some more than others. Wood is a potential weak spot, as it will eventually rot with water exposure and time, Even though encapsulated, a wood transom should be checked for rot on an older boat.
In my opinion, better quality fiberglass cuddy boats for rough water include Pro-Line, Grady White, Boston Whaler, Sea Ox, to name a few. If towing weight is a concern, don't discount the aluminum 23 - 25 foot cuddy's from StarCraft. They handle rough water well, though do pound a little at speed in rough water. And that brings up another point, I don't care what hull material you have, or boat weight, no 23 to 25 footer is going to operate at high speed in 3 or 4 foot chop, at least not safely and comfortably. My only real issue with tin boats is they get blown around more (drift) in the wind than a heavier glass boat, especially with the canvas up. Only an issue really when you are trying to troll slow. Dual motors are nice, but I have always used a single out board, with a 10hp kicker mounted on a bracket for trolling, and emergency "get me back to the dock" use.
I'll repeat myself, having an experienced boat mechanic check out a potential purchase is the best money you can spend when buying a used boat.
I attached a pic of my old, trusty Sea Nymph with its new motor from a few years ago, and a pic of a buddy on his first fishing trip, with his first fish - a 10lb Lake Ontario Brown Trout...
Larry