head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Mini Motorways demands more variance.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.

Optimization · Pure Optimization
Road-network puzzle sister to Mini Metro; routing under pressure.
Fallout: New Vegas leans Optimization (Pure Optimization); Mini Motorways leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Mini Motorways
real-time road drawing
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Mini Motorways
no opponent
Mini Motorways leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Mini Motorways
house and destination spawn
Mini Motorways leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Mini Motorways
road network design
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.