I will say that I have many many choppers and to me alot has to do with the handle. The better in your hand it feels and less hotspots the better. Of course steel is important but if you are chopping for a really long time or doing alot of hard woods chopping a comfortable handle (and I would wear gloves is a must.
I will start with the CGFBM. I really like this knife, it feels good. Not too heavy to carry (for me I am 6'4 around 200lbs) and feels good in my hands. I modified the mag handles slightly and convexed the edge. It chops well and holds an well (its INFI)
Next is the FFBM it lacks the Corregated Bevels the CGFBM has and instead has a sabre grind and also has a convex edge. Its thicker as well (dont have my measurements on me but someone knows). Its a heavier beefier knife for sure also INFI. I have done lots of chopping with this one too and your arm gets tired after a while due to the weight, not as nice to carry.
The NMFBM is a bit longer than the FFBM but is a similar package. Longer but feels similar in the weight, I really like the knife and its also a beast. I have used this one alot to split wood, it rides kind of heavy and I would recommend a leg strap just as I would the FFBM. It chops really well but like all heavy knives you do get tired quicker.....but then you may have to make less cuts. Not an use pic but one to give you size.
The HI AK 16" is a nice knife with a good convex edge and throws chips diffently then the two mentioned. For me its not as comfortable to chop with w/o gloves as the wood is a bit slippery and I have since roughed it up. It chopps diffently being a Khukri but is lighter and in a more compact package still chops well. Not shown is a bonecutter by HI at 18" overall its a substantial knife and though thick, doesnt have as great a recurve as the AK and a bit more heft at the tip. Very good chopper and has done well by me.
Possibly my favorite is the Scrapyard Dogather in LE or CG (I have both). They are SR-77 steel which doesnt hold an edge as well as say INFI or W2 but its a tough steel. Its much ligher than the first two and the Respirine C handles are VERY comfortable in my hands. It chops great for its weight and is not hard to carry at all. I really recommend this one.
I will also mention if you want an easily affordable knife thats good steel but not as Hefty a chopper to go with an RD9, handles are a little smaller to me but its a light enough knife but still carrys a good punch for chopping. 5160 I believe and holds an edge well like Justins Knives do. A big advantage with this one is that its more affordable, easier to get and comes with a sheath. The coating on mine doesnt hold up well but it may just be mine. Been a nice knife to use so far.
The one on the Top of this pic is a Dui Churra by HI, its a BEAST and I consider it a bit big to carry on the person. Its a mean chopper but a bit unweildy and hard to stop once it gets going. Probably not what you want in this instance. It cleaves limbs easily but I carry it on a pack as its just that darn big.
I will also recommend the Becker 9. Also a good knife that I have had convexed. Its not overly heavy and the steel holds up well. The handles are not as comfortable to me as the Scrapyard and the Busse, I dont think it chops as well either. But you can get the Kabar version readily right now.
I dont have any chop #'s IE: this many chops per knife but they all have done well by me and have all seen ALOT of use around the farm and just for fun. I have custom choppers but since it sounds like your looking for production or semi-production I listed these. I had a Ferhman extreme Judgement but gave it to my brother as I just couldnt get into the handle, so I dont think I could give a proper review for it. I really like INFI for choppers, its a tough steel that strops well and holds and edge nicely. You can do really well though with a simple too steel like A2, D2, W2, 1095, 5160. All those have done well for me. HI's are great choppers as well it just depends on whether your into the Khukri style or not. Not mentioned where the RTAK and RTAKII I just couldnt get into the handles for those either but they have been good knives, just not ones I grab much.
The one I grab the most is the Dogfather, I am partial to it and its just been a fantastic knife. I commented on a few but I have just too many to go on. I hope this write up is found useful, I could have commented more on all the knives just hard to do a proper write up on each one.