The Davis Folwing Gun flintlock, the Chambers English Fowler and Virginia, and the L&R Queene Anne are of similar vintage and are good for guns from (I'll say) 1740 to the Revolutionary War. They all have different styles and sizes and that's what would induce me to use one over the other. Of course Chambers locks have the reputation as the best but I've not tested these head to head. Large locks often spark like crazy. There's a lot of flint, a lot of frizzen, and a wide old pan. Something's bound to catch.
I like the large size and "fullness" on the Chambers English locks, and on the R.E. Davis, I like that it comes without a pan or frizzen bridle. Many locks exported to the colonies from England lacked the refinement of a pan bridle. I wish the lock was a little bigger. The L&R is also a little smaller than the Chambers, about the same size as the Davis. I'd use any of them depending on the gun. With a big-barreled fowling piece (1 and 1/8" or bigger at the breech) the Chambers would get the nod. For a militia gun, I'd use the Davis or the L&R, which is not as finely styled for my taste as the Chambers. And a less "high end looking" lock works better for some applications.
Think about the Chambers Early Ketland too without the pan/frizzen bridle for a gun from 1750-Revolutionary War.
Earlier fowler locks than this in English styling are hard to find on the market. Easy to find a big banana shaped, flat faced "jaeger" lock and I have seen such locks modified (by Mike Brooks, I think) to be rounded etc.