I haven't been on the newest generation of backhoes, because I got out of backhoe work for larger stuff.
That said, even though I have been a Cat fan all my life, you can't beat a Case hoe. I have had both and I would take a 5 year old Case over a new Cat any day. The Case K series had the production, but had a few weaknesses. These were all fixed with the L series, and the M is just a further refinement of what was already the best machine.
I had a Cat and the boom broke, the stick broke, the swing tower broke, the front loader arms broke, the brakes failed, and the diff went out, and that was all before it had 3,000 hrs on it. As if the broken parts and downtime was not enough, it was weak digging hard dirt, would not lift near as much as the Case, even though it outperforms on paper, and it struggled when in mud or climbing hills where you needed to assist with the hoe. Places the Case would tackle with no problem were an ordeal with the Cat.
My 580SL Case had over 8,000hrs on it when I sold it, and the worst problem it had was a worn out starter, a couple of hoses, and some tires.
Just my $0.02 worth