I do recall Robert "Chakotay" Beltran making comments to the effect of how the TNG cast were more of a family, but that the VOY cast simply didn't bond like that on their set. There was certainly more tension on the VOY set, even if it never did spill into outright hostility. And certain cast members, particularly Robert Picardo, seemed to have got along well with everybody.
My recollection from an interview somewhere was that Beltran seemed to resent how the writers gave Picardo so many good storylines and things to do.
If I got this right, Beltran was told that "the Doctor" was getting good material because Picardo would come up with ideas himself and pitch them all the time. And Beltran complained about it, essentially saying "that's not my job" and you should be coming up with better things for me to do.
I found it ironic that when they finally had Chakotay carry an episode, it was that terrible boxer illusion/fantasy/metaphor story which for me was by far the worst show of the series. They gave him an episode, but it was a boring and murky story that no one could have carried off-- except possibly Jeri Ryan, who would have shined in the topless scenes.