Yes, I can directly compare them all. I've run them all. The MR501 are the best of the bunch.
The Ambush are decent but much better when cut.
Any ITP or Maxxis tire will be overpriced and underperforming. Again, I've run lots of them, so it's not just hearsay.
I've also run Kenda Klaw and Knarly. They're good for road riding because of the harder rubber compound.
I can go into more detail when I get home but I've got first hand experience with them all.