Chin-ups are a back exercise first, but many lifters turn them into an arm-dominant grind. Better intent, setup, and execution help the lats do the job they are built to do.
Side-to-side pull-ups punish the top range where many lifters cheat the most. Stay above the bar, move with control, and earn every inch.
More ugly pull-ups are not better pull-ups. Fewer high-quality reps, smart set structure, and eccentric work can build strength with less wear and tear.