It is really hard to pick just one dive site as my favorite. Each Great Lakes wreck site is unique in itself. The thing that intrigues me the most about shipwreck diving in the Great Lakes is the history. Each one of these wrecks have a great story behind them. Being a diver and being able to witness and touch these historic capsules is truely amazing.
If I had to pick a wreck, for me it would be the Regina in the Sanilac Shores Preserve. Its not the most picturesque wreck, but the history is amazing. Being one of the ships lost in the Great Storm of 1913, it has lots of lore behind it. Also since this wreck sits in less than 100' of water, it is accessible to almost all levels of divers and has many features that can be enjoyed by everyone. As well, since it is easily in rec diving limits, a diver can have a significant amount of bottom time exploring without having to take on any deco obligations. Since the ship is sitting turtle, the propeller is an amazing site to see as you descend to the wreck. The nameplate on the stern and the bow are just amazing to view. The debris field scattered out from the wreck is a great place to poke around and see artifacts from a time gone by. For the technical diver, the ship is amazing on the inside. The engine room has so many features to explore. A technical diver can spend an entire dive poking around the cargo holds viewing the general cargo the ship was carrying.
I also feel this is a great wreck because it is so easy to get out on a charter and dive it. Out of Port Sanilac, MI there are multiple charter boats going out EVERY WEEKEND to the dive sites. If you wanna dive, a charter boat is going. This past dive season was amazing for lake Huron. I think I was only blown out 2 times all season. Most of the weekend dives, the lake was completely calm!
Anyway... Enough of my rant... Hope it helps you!