Angled grip, happier wrists, bigger biceps.
The angled grip eases wrist strain, keep your elbows pinned and don't swing the bar up.
The EZ bar's angled grips let your wrists sit at a natural half-turn while your biceps curl the bar through the same arc as a straight bar. That small rotation is the difference between wrists that ache and elbows that let you train curls hard for years, with barely any trade in bicep tension. It's the default heavy curling tool, both hands on one bar, no side sneaking out of work.
Near enough that comfort should decide. The straight bar forces full palm-up rotation for a touch more bicep bias, but if it hurts your wrists you'll never load it hard, and the EZ bar you can train hard wins.
The angled inner grips, as the steps say, palms turned slightly in. The wider outer bends put your hands further apart with more angle, worth trying, but the inner grips are the standard curling position.
Pin your elbows to your sides and keep your torso dead still, if the bar needs a hip bump to get moving, strip weight. A cheat curl trains your ego, a strict curl trains your biceps.
