I have never used a May or Ingram. I am sure they are fantastic. But I can say this much:
A knife (or at least a fixed blade) is basically three things. A blade, a handle, and a carry system of some sort.
Bob Dozier is known for his D2 heat treatment. His knives are renowned for their edges, sickenly thin grinds, and their edge retention. He is the dean of D2. This doesn't mean May's or Ingram's knives will not cut as well or hold an edge as long, but Dozier is really a legend when it comes to that stuff.
Dozier is also known for his extremely comfortable handles. They feel good in every grip. Again, I am sure May and Ingram make comfortable knives, but Bob Dozier is considered by many to really be the king of great handles.
And sheaths? Well, Bob Dozier is probably the best sheath maker. Period. Personal opinion, of course, but it isn't an unpopular opinion.
Whether Dozier, May, or Ingram is better for you is for you to decide. It is totally subjective. You might like A, while Joe Smith likes B.
But without experiencing several knives from all three makers, well, Dozier has the better rep in every applicable area, as far as I can tell.
I am sure I would like May's and Ingram's knives as well, but the ergonomic ques I see in Doziers knives do not appear to be on May's and Ingram's knives. And I doubt they may the best Kydex sheaths in the world, because Bob already holds that title. So I don't see much of a reason to try a May or Ingram knife when I can spend the money on another Dozier.
While my opinion is my honest opinion and not colored in any way by invalid motives, you may want to take what I say with a grain of salt. I am a big Dozier fan. But I speak highly of his knives and am a big fan because the knives deserve it.
I am selling off all of my other knives so that I can buy more Doziers. I do not see a reason to use/carry any of my other knives when I can use a Dozier instead.
That may either make me seem very biased, or maybe show you that Dozier's knives are worth looking into.
However, Dozier's knives also tend to be more expensive than the other two makers. That is a factor.
For a ~4 Hunting Dozier, look at the Yukon Pro Skinner, Master Skinner, and Master Hunter (through A.G. Russell).
Between
www.dozierknives.com and
www.agrussell.com I am sure you will find something you want.