Which machines best for home use ???

[JAZZCNC]

If the say the middle 4 or 5 lines show no burning and u are getting a fine dust then you are heading for the right combination.

No fine dust is exactly what you don't want.? You want a nice Big FAT chip. If your getting Fine dust then your probably not cutting deep enough and in your case with 6mm cutter (Carbide) you would have been better at 100% DOC provided you had the spindle power.
Also this high lights my point about Cheap low cost ie Chinese machines not being upto to cutting MDF correctly. I know you had chinese machine and that it coundn't cut at the correct feedrates for MDF with Carbide or HSS tooling.
Carbide would require feedrates in the 5mtr/min + region with 100% + DOC. HSS would require less DOC but still would need feedrates in excess of 5mtr/min.
Most low cost machines can't even Rapid at those speeds let alone cut.!!

In both cases Good Chip Vac would be required.

There's difference between managing to cut a material and cutting that material correctly to give best finish and tool life. In DIY arena this isn't so important but from money earning and Business point of few it's VERY important.