How can you even compare them? You can buy 5 HG to one degritter.
It's a superior machine in almost every way, but you pay for it. I have a HG also used my friends degritter. I prefer it over my HG, but it's out of my budget. You can use TERGIKLEEN in you HG that will next level it. Also, clean really dirty records 2-3 times, usually I'll flip the album over in-between.
The HG is a great unit, about the only thing in its price range, but it has limits. The Degritter has more power, has different UC frequencies, is at the top of the chain, where the HG is at the bottom.