Gerber StrongArm runs a 4.8″ drop point blade in 420HC; Gerber StrongArm MagnaCut runs 4.8″ of drop point in CPM MagnaCut. The Gerber StrongArm is the lighter of the two by 0.40 oz.
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Gerber StrongArm · Drop Point
4.8″ blade · 0.187″ spine · 7.2 oz · ~1.3″ tall
Gerber StrongArm MagnaCut · Drop Point
4.8″ blade · 7.6 oz · ~1.3″ tall (derived) · family outline
Spine thickness, same scale
0.187″
Length and spine thickness drawn to true scale from published specs. Outlines traced from makers' photos, except where marked as the shape family's.
The current answer to “why must I choose?” — near-tool-steel toughness with better corrosion resistance than S30V. The default recommendation for a hunting fixed blade that lives in a wet sheath.