bias variance

The textbook answer gets a polite nod. The version that names which side of the tradeoff a 6-week customer pilot usually dies on gets the hire signal, here's that version.

Both are tree ensembles, but one averages independent deep trees to kill variance and the other adds shallow trees in sequence to kill bias. That single difference dictates the failure modes, the tuning burden, and which one you hand a customer who will retrain it after you leave.