I have had both 2 wheel and single. For outdoor practice and ease and consistant with both jugs and real balls , get the jugs single wheel. If you need over 55 mph get the super softball, otherwise the regular one is just fine. I also have had bata 2 wheel , very fast with breaking pitches, we honestly didnt use it to its capabilities. ( curves , drops ect...) . Btw we are an 18u team. I now use the jugs regular and move it to 32'-35' if i want over 55 mph. Jugs is the most consistant with real balls.