whats best ND Filter(ND8) for 77mm lenses and outdoor cinematography?

i want to buy 2 ND filter for my canon 24-105 f4 and canon 50mm f1.8 . but i dont now nd8 is better for me or nd16.
often times i shoot video in 11am 12am 13pm 14pm. and some times shoot in 17pm untill 20pm

which brand is better? tiffen or schneider? are there any nd filters better than those brands?
 
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