The Matrix one is good as you can edit your HSC marks, percentile and scaled marks on the go without re-calculating everything.
Einstein and vision education calculators are very similar except the one on vision education has better presentation and the pie graph looks quite good.
Overall...
Agree with sunnaye.
I have done both as well.
When i was getting private tutoring at my place i tends to get distracted and less focused.
While in a group environment i am generally more focused and switch-on because of the people around me. But i guess this is subject to size of the class...