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.

Optimization · Pure Optimization
A Napoleonic strategy game testing empire economy and battlefield formation play.

Optimization · Pure Optimization
A landmark strategy game combining a turn-based campaign for control of Rome with massive real-time battles.
Imperial Glory leans Optimization (Pure Optimization); Rome: Total War leans Optimization (Pure Optimization).
Rome: Total War leans a little harder on execution, though the gap is small.
Imperial Glory
Pausable battles and turn-based empire management, minimal dexterity
Rome: Total War
Real-time battle micro rewards quick unit handling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Imperial Glory
Human multiplayer battles allow some feinting, AI doesn't adapt
Rome: Total War
Optional multiplayer battles; campaign AI is mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Imperial Glory
Diplomacy outcomes add modest uncertainty
Rome: Total War
Diplomacy and AI moves add modest fog
Rome: Total War leans a little harder on optimization, though the gap is small.
Imperial Glory
Economy, research and Napoleonic battle formations are the solvable core
Rome: Total War
Campaign economy, recruitment, and battle tactics are solvable
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.