Schneider 680, 750 or both?

Hmm... read up a bit, watched some videos (ablecine) and I can't quite figure out if this decision is a:
1. Need both different applications scenario
or
2. One works best for BMCC EF
Has anyone done any hands-on testing with these filters and reach any "conclusions" or best practices?
I may be missing the boat on a different IR brands/types but I have quite a bit of ND already and I'm not interested in updating to combination filters.
I'm befuddled by the search on this forum, but I remember a shootout that had some examples...
(found the ryan walters piece, he reccomends the 680)
If you're willing to share your experiences that would be great! Thanks.
Dave
1. Need both different applications scenario
or
2. One works best for BMCC EF
Has anyone done any hands-on testing with these filters and reach any "conclusions" or best practices?
I may be missing the boat on a different IR brands/types but I have quite a bit of ND already and I'm not interested in updating to combination filters.
I'm befuddled by the search on this forum, but I remember a shootout that had some examples...
(found the ryan walters piece, he reccomends the 680)
If you're willing to share your experiences that would be great! Thanks.
Dave