head to head
Shellshock 2: Blood TrailsvsUncharted 4: A Thief's End
Shellshock 2: Blood Trails leans Execution (Pure Mechanics); Uncharted 4: A Thief's End leans Execution (Practiced Mastery).
Shellshock 2: Blood TrailsUncharted 4: A Thief's End
Axis by axis
Execution6 vs 5
Shellshock 2: Blood Trails leans harder on execution: Aim and reaction to ambushes is all the game asks
Reads0 vs 1
Uncharted 4: A Thief's End leans harder on reads: Scripted enemy AI throughout.
Variance1 vs 1
Even - both lean on variance about the same.
Optimization3 vs 3
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.

