For what it's worth....
I grew up sailing a Tanzer 22 on Lake Huron (was a '72) and I am now the owner of a '76 Mirage 24.
Of the 2 boats, I much prefer the Mirage, not just cause it's mine, but cause it's dead easy to sail, and it's faaasssstttt!!!
Of course, I have the previous owner to thank for setting it up as a single handed racer, but we've also used it as a floating cottage this past summer and have spent many nights aboard.
You won't go wrong with the Mirage in my opinion, just make sure the deck plugs have been re-sealed prior to making the deal as these boats did have a problem with water coming in at the deck joint if not re-done.
1976 Mirage 24'