For me, TOS worked better in the films (not including nuTrek).
Overall, TNG worked better for me on TV (apart from First Contact which I loved), but I think if they instead took a decade or so break between TV and film and had new writers/producers at that point, their film outings could have been truly epic. Who knows.
DS9 worked very well for television, but I believe it could have also worked nicely as a semi-serial film series. Loved what we got with the TV series though.
Again, my opinion.