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 · Pure Mechanics
Keeping speed through destruction-racing chaos that punishes clean-lap plans.

Execution · Twitch Chaos
Drift execution and team-boost coordination under item-roll randomness.
FlatOut: Ultimate Carnage leans Execution (Pure Mechanics); Team Sonic Racing leans Execution (Twitch Chaos).
FlatOut: Ultimate Carnage leans a little harder on execution, though the gap is small.
FlatOut: Ultimate Carnage
Holding racing lines through wrecks and ragdoll chaos tests hands
Team Sonic Racing
Drift lines and boost timing decide lap pace
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FlatOut: Ultimate Carnage
Rival drivers ram predictably, light multiplayer jockeying
Team Sonic Racing
Online races add light rival positioning play
Team Sonic Racing leans a little harder on variance, though the gap is small.
FlatOut: Ultimate Carnage
Debris and pileups scramble any planned lap
Team Sonic Racing
Item rolls swing positions mid-race
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FlatOut: Ultimate Carnage
Car upgrades and track shortcuts are mappable
Team Sonic Racing
Team mechanics and car tuning add learnable layers
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.