head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
A turn-based tactics game testing positioning and squad management under RNG.

Optimization · Pure Optimization
A turn-based strategy game where building the optimal army and economy decides victory.
Arma Tactics leans Optimization (Pure Optimization); Heroes of Might and Magic IV 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.
Arma Tactics
Turn-based - no twitch demands
Heroes of Might and Magic IV
no real-time physical skill needed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Arma Tactics
Enemy AI scripted; some randomized objectives but no adaptive mind
Heroes of Might and Magic IV
predicting human opponent strategy in PvP
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Arma Tactics
Hit chance and randomized missions add real randomness
Heroes of Might and Magic IV
combat rolls and map resources random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Arma Tactics
Positioning, cover and weapon use are the core tactics
Heroes of Might and Magic IV
army building and economy near-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.