But Fallout is level-based, GURPS is free point-buy.
Fallout HP grows like in D&D and is a major contributor to survivability, GURPS HP is largely fixed in a short range (survivability comes from dodge and parry scores).
Fallout hands out Perks on a per-level basis, GURPS assumes you start out with a bunch of Advantages right away.
Fallout bundles Traits into benefit/drawback pairs, GURPS *mostly* has those freely-assignable (with point budget adjustments).
GURPS is bell-curved 3d6-based (and strictly d6-based). Fallout is d100-based in skills, d10 in attributes, and don't remember what dic…