Michelin is, as you suspect, a solid well made tyre with a good brand name behind it. Mostly V rated high speed tyres
On the Macadam's: be sure to check the manufacture date, as these tyres have gone out of production as of last year. Perhaps you can the salesperson into a deeper discount if more than 2 years old.
Note you are getting a slightly older tyre compound - not as sticky as newer tyres and perhaps not the best in the rain. Priced right and long lasting are their main claims to fame.
Also, as @goon1492 mentioned, centre groove tyres have their weaknesses.