Sorry but my comments will not answer your question as you have not really provided enough info..
In the first instance, Commercial vs Domestic;
1: *comes down to your use of the machine...
2: *Reliability / Build / Throughput...
If I could I would have a G3 at home = Domestic also = domestic argument that I can not win.
First off, I would follow up with some real training with one of the sponsors.. * Over there to the left * <-----
Then, Space Vs Tank or Plumbed Vs Boiler or Thermo block Vs Throughput Vs Steam and Milk Vs Black Vs Beans Vs Water system Vs Noise Vs etc Vs $$$$
Oh, then add in the step less grinder *at $$$$
So your pocket is how deep ?