The above is moot on '13+ US Leafs. In the US, starting with '13, if the car comes with CHAdeMO, it will have the 6.6 kW OBC. 3.x kW OBC car with CHAdeMO inlet is not a valid combination on '13+ US Leafs.
On '11 and '12, that wasn't the case but back then, the 6.6 kW OBC didn't exist.
For me, 6.6 kW OBC helps 5 to 7 days of the week. I have not had a car with CHAdeMO since July 2015. On my 2 year leased '13 with CHAdeMO, I used that inlet 16 times in total on free DC FCs. Those free ones are no longer free. Very few are free anymore and the rest are more costly to use to fuel my Leaf than it is to fuel my Prius.
'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)