Hard to say, there are so many different types of actor. I, personally, have always had a thing for Cary Grant. Totally dreamy and great comedy actor. But Gegory Peck is a fantastic serious actor.
As for actresses... Meryl Streep springs to mind for talent, but I doubt she will get many votes, as she is not a t!t showing sex symbol 😉. I also think that Cher is incredibly talented is so many areas, even though a lot of her stuff is not to my taste. Most all around talented male.. I would have to pick Will Smith.
I think it is impossible to pick just a few in a time span of our lifetime. If we had to pick the best in the last decade, or the last quarter century, that would be one thing. But the best of 'our time'? My time is longer than most here, and I am partial to older movies.
🙂