Stability or momentum?
stability always. executing a movement efficiently and targeting the appropriate musculature requires stability and rigidity in certain areas, not momentum!
rowing movements are notorious for using momentum. why? due to resistance and strength curves (this was mentioned in the uebc by nick tumminello. think about these questions relating to each curve;
👉resistance curve, where does the resistance get harder/ easier?
👉strength curve, where you are the strongest/ weakest in the lift?
the hardest part of a seated row is the end of the concentric. this is why you see a lot of people doing some crazy swinging s**t to move the weight
keep yourself rigid and stable in the appropriate places to perform an effective row. you may end up with some better back gains 🤔