which odonnel plug is best?

I recently bought a used JAE 21 with a Nova Rossi T21-7M. This will be my first 21 engine in a rigger after running 21 tunnels. In my tunnels i used to run MC-59's, but ran out of these. Have seen several recommendations for plugs in 21 riggers, O'Donnel Blues, 99's, 89's? Which plug is best in...