I have tons and tons of IR's from over the years. I think the Ownhammer Revolution is an amazing value and really captures a broad variety of tones including staple cabs like Fender Deluxe, Vox AC30, Marshall 4x12 with Greenbacks, Mesa 4x12 with V30's, etc.
What I like about Ownhammer is they are consistently shot so it's a little more predictable to find what you're after. If you flip from one cab to another, you aren't surprised by one being super bright and one being super dark. The Revolution ones are also very well shot with a little cleaner low end than older Ownhammer.
The downside is that Ownhammer included IMO way too many mixes and options. There's almost 9,000 impulses from what I can see which is completely overwhelming. In older packs there used to be a quick start folder with just a handful of mics and mixes. The Revolution pack doesn't have that which is frustrating. You can kind of pull together your own but it takes a lot more work and experimentation.
I have a ton of York Audio stuff as well and to my ears it sounds more raw and direct where the Ownhammer sounds more polished and mixed. Again the Revolution stuff is a little cleaner and more raw sounding than the old stuff which is nice. But you can get some of that jumping around tonality on the York impulses where Ownhammer maybe sounds a little more EQ'd to sound more similar.
Compared to factory IR's, I'm really trying to embrace those more. There's a huge variety of factory IR's and I think you can get just about any tone with them, it just takes more experimentation. But to be honest you have to also experiment and spend time with aftermarket IR's too. So it can be a wash.
What I've been doing is flipping through presets and when I find a sound I like, I save the cab block as a library preset. Then I can easily paste the cab block into a new patch. When I A/B against my Ownhammer/York impulses, I often find I prefer the cab blocks I saved from factory. Some that I like are in the Marshall Plexi 100W and Brit 800 patches, like the Legacy 60/61 combo (Fractal 4x12), Legacy 103 (4x12 TV), Legacy 59 (4x12 TV Mix), Legacy 119 (AC-20), etc. I like to have some brighter and darker options depending on if the amp is bright or dark.
Another piece of advice Justin York recently gave is to not try and do all the EQ'ing through the impulse but through the amp controls. I think that's where I get in trouble, because the impulse can be so powerful on the overall tone. But in reality the different impulse mixes for the same cab are often more subtle, and it may be better just to adjust the high/low cuts or amp EQ. Or use a different cab altogether.
Yet another thing you can do with the FM3/Axe 3 is to use two mics and blend them together to taste, so picking a 57 and a 121 which gives you a bright and warm option, then lower the volume of one to taste. So if a cab sounds bright, lower the 57 which will raise the volume of the 121 and give a warmer sound. You just need to make sure the solo tone of the 57 is bright and 121 is warm, otherwise pick a different impulse or cab.