Personally I chose the Flying Scot.
I don't think you could go wrong with either (or a Thistle).
I have never sailed a Lightning but watch them at my club.
The Flying Scot is a simpler boat. The Lightning has many more 'tweaks' you can do.
The Flying Scot is a 'sit-in' boat with real bench seats. I believe the Lightning is a 'sit-on' boat - no backrest.
Are you interested in racing? Then you might want to see what the dominant fleet in your area is.
The Lightning is a bit higher performance. The Flying Scot is a good all round boat, but doesn't really shine against other classes until the wind pipes up.
If you are just day sailing, a couple of other boats to give a thought to are the Boston Whaler Harpoons, the Buccaneer, and the O'Day Day Sailer.
What part of Michigan are you in? You might want to check the Flying Scot association (Flying Scot® Sailing Association, Inc.
) and find a local fleet and see if you can hitch a ride through them.
All of the boats mentioned have pluses and minuses. Really depends on your experience, how many are sailing with you, what are their ages, and what you are looking for.
I love the Flying Scot as it is pretty stable, comfortable for my non-sailing wife and two young boys (4 + 6), durable, and still has performance to race.