What distinguishes Overwatch from Tf2

I don't like it when people compare OW and TF2.
They are 2 very different games. Which satisfy (At least for me) 2 very different needs.
The only things they have in common is the genre.

Overwatch is much more competitive I found. And requires a different set of skills.
The gameplay is incredibly different.

Now, if you compared Paladins and Overwatch. That's different.