even though both are daggers,
they are not equally matched in size or spectrum.
Gerber De Facto
Blade Length: 4.0″ Spear Point Blade (with dual serrations)
Overall Length: 8.875″
Weight: 3.9 oz.
Weight with sheath: 5.1 oz.
Constructed from durable S30V steel
Spike Pommel with lanyard hole
Rubberized grip
TAN499 Injection-molded handle
Single Piece Sheath with friction lock and secondary retention lock
Scorpion Knives Dagger
Hardness: Rockwell 53-55rc
Blade Length: 7" (18 cm)
Blade Material: x46Cr13 (420 Stainless Steel)
Blade Thickness: 6/32" (5mm)
Overall Length: 13.25" (33.6cm)
Handle Material: Black "ERGO" Rubberized Grips
Sheath Material: Cordura
Weight: 14.75 ounces (390g)
having said that, i would see the de facto as a better choice between two evils.
not a steel snob, but anything's gotta be better than 420.
not unless edge holding is secondary consideration.
i am however torn by the sturdy built of the other make.
it is a well todd of design for specialist military applications
http://www.fighttimes.com/magazine/magazine.asp?article=845
but seeing that practicality was a criteria for you,
i feel that the shorter de facto would serve better for general applications.
as a rule of thumb, size matters for the "law abiding ;-) " in non-conflict zones.
but only your gut feeling will draw you to a conclusion.
yup, if you're collecting it's best to acquire them all while you can.