It really depends on the knife....
On a Basic 10 LE, I prefer not having a choil because it's light enough to choke up on the spine easily.
But on the Rodent 9, I think the choil makes a lot of sense because it weighs almost twice as much as the B10LE.
I like the small choil on the War Dog & Basic 4 LE because it's there if you need it, and if you don't then it doesn't waste too much edge. They may not be the most usable choils, but they work as choils for me and my little fingers.
Just my preferences, which is what this all boils down to....