Neither. Both. It depends.

The joined Trill gets their bonuses and the Borg gets theirs. It all depends on what most matters to you. You have the list for both, so you can get in game and look at those skills, take some notes on what they affect, and then figure out which way to go from there.
If a species is giving you a bonus in something that you want, there is no reason not to take it, unless you already had your mind made up to play as something else, in which case it wouldn't matter, or if you are trying to use those abilities to compensate for something and strike a balance, which would require you to make those notes, anyway.