Best Brushes for Photorealistic Art

Which brush should you throw away right now...?
This week, we're looking at what brushes I recommend to all my oil painting students, and how you can use them to achieve stunning photorealistic results.
But what brushes do you use? And do you use the brush I really don't like... If you do, I'd love to know why!
I forgot to mention that these brushes I use are often sold as acrylic or watercolour brushes, but sometimes just as synthetic brushes.
Happy Painting!