head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Pure Optimization
A squad-based post-apocalyptic tactics game where AP efficiency and burst-fire builds determine mission success.

Optimization · Pure Optimization
A blade-driven JRPG won by chain-attack routing and combo optimization.
Fallout Tactics: Brotherhood of Steel leans Optimization (Pure Optimization); Xenoblade Chronicles 2 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Tactics: Brotherhood of Steel
Real-time optional combat mode adds positioning pressure over pure turn-based
Xenoblade Chronicles 2
Auto-attack with art-timing inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Tactics: Brotherhood of Steel
All enemy squads run fixed scripted patrol and engagement routines
Xenoblade Chronicles 2
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Tactics: Brotherhood of Steel
Enemy squad compositions and map layouts are hidden on first approach
Xenoblade Chronicles 2
Blade gacha and crit rolls
Fallout Tactics: Brotherhood of Steel leans a little harder on optimization, though the gap is small.
Fallout Tactics: Brotherhood of Steel
Squad AP optimization and burst-fire perk stacking define dominant strategies
Xenoblade Chronicles 2
Blade combos and chain attack routing central
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.