Trap bar is more of an "athletic" movement in my opinion, and it uses slightly less lower back, but more leg drive. It locks you into a position to go straight up and is somewhat easier. I got to 450 lbs on the trap bar and decided to go back to straight bar deadlifting, and when I started my regular deadlift max was at 405. It takes some time to get the numbers up, but week by week I am starting to increase a bit and now its up to 425, that close to 430.
Straight bar definetely hits the lower back more. Needless to say, if you are doing any variant of the deadlift its all good!
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