lol...

What do I look for? How about one that hold air!

Other than that, I have tried most clincher tires a time or two.
It really depends on a few things, like what do you want out of a tire?
How many miles do you expect out of a tire?
How light/heavy of a tire will work for you?
and so on...

I ride Marathon Supreem Plus tires on my city bike.
They are like the bike, heavy and sturdy. I'm not in a race when I ride that bike.

I use Ribmos on most of my other bikes, They are lighter than the MSPs and long wearing.
The pasellas work very well too.