Having owned and sold Quick Draw I'll go with:
1. Sheriff
2. Quick Draw
3. Bronco
The secret to high scores on QD is to keep the ball away from the drops as the outlanes are tough on this one. I love the artwork and quick bonus count but I got tired of it surprisingly quickly.
I've never played Sheriff but I like the asymmetrical layout and you can never go wrong with a 10 target bank. I'll give Sheriff the nod in artwork too.
Bronco is OK but lacking in drop targets - 3 is not enough!
Play the games if you can...