If you are in the UK or SE Australia, then you would get good coverage from planeplotter. I think there's only 5 people in the USA and Canada that use it.
ACARS position data is added to non-position Mode-S reports, so that's kind of neat, but then ACARS planes with position data usually transmit about 4 times across the state. Not enough to keep your interest up.
One advantage might be, that it is inclusive of SBS-1 and radarbox users. Radarbox doesn't have any way of importing sbs-1 data and the sbs-1 can't import radarbox data. So that might be a way to get a radarbox and an sbs-1 to share data.
The radarbox is supposed to have a compatible socket interface with the sbs-1, but most people that use planeplotter have hacked sbs-1 that deletes the 5 minute delay.
Anyway, it appears that Europe shares more ADS-B data in various forms than in the USA. So if you are in Europe you should have plenty of ways to plot data.