Depends on your form. With a bar you can lift wider with more weight. One arm rows you can move your hand position, width of lift, angle during the rep. It also isolates better imo. one arms are more versitilebut most can do more weight with the bar. JMHO
The basic movement is the same, but the lack of stabilization that the barbell uses causes different synergists to be used. It basically hits it at a different angle. I use both
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