Is the dash or comma a better fit?

Are all three punctuated correctly below? If not, which one would you choose in each set?


Set 1

1) What is he on, drugs or something?

2) What is he on – drugs or something?

3) What is he on? Drugs or something?


Set 2

1) Which one would you choose, one or two?

2) Which one would you choose – one or two?


Set 3

1) I'd like to introduce you to my new financial partner, Mr Dave Jones. (This one looks too much like a direct address.)

2) I'd like to introduce you to my new financial partner – Mr Dave Jones.


Thanks.