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

Execution · Competitive PvP
WWI conquest shooter with weighty gunplay.

Execution · Competitive PvP
Fast aim duels plus predicting human movement on memorised maps.
Battlefield 1 leans Execution (Competitive PvP); Call of Duty: Modern Warfare Remastered leans Execution (Competitive PvP).
Call of Duty: Modern Warfare Remastered leans a little harder on execution, though the gap is small.
Battlefield 1
Bolt-actions reward steady aim and timing
Call of Duty: Modern Warfare Remastered
Snap aim and reaction time dominate every gunfight
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 1
Trench flanks and gas plays beat predictions
Call of Duty: Modern Warfare Remastered
Online opponents rotate and adapt; pre-aiming them is prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 1
Behemoth spawns and chaos shift matches
Call of Duty: Modern Warfare Remastered
Spawns and random lobbies inject per-match noise
Battlefield 1 leans a little harder on optimization, though the gap is small.
Battlefield 1
Class kits and vehicle counters matter
Call of Duty: Modern Warfare Remastered
Map control, loadouts and timing form a learnable meta
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.