It seems that you want to know if is there any difference in the picture quality between the Slingbox SOLO and the Slingbox PRO-HD when streaming to tablets.
First, the Slingbox PRO-HD is the only one capable to stream the HD signal. However, none of the available SlingPlayer application for tablets is capable to stream the HD signal. They are capable to stream the High Quality (HQ) signal, but not the HD signal.
Hope this helps!