Deadly Strike VS Chance of Crushing Blow

[Nicator]

Deadly strike deals double damage. Crushing blow (in theory) takes off half of the enemy's current hit points. ...

Yes, Deadly Strike doubles the total physical damage, and alike Crushing Blow is affected by physical resistance. Although real Crushing Blow effects are explained at Spirea's Diablo II Resource.

Given high hit points in monsters, which you can find at d2data.net, I would say that Crushing Blow would be a better choice, unless an IAS breakpoint with a shael or a huge damage in weapon.