Two old knives. Which is more worth refurbishing?

I know they are both mid to low tier knives, not expensive, but if anyone owns either or has some insight, which is the “better knife” and more worth refurbishing? One is a mueller and not sure of the other, both feel firm and stable in hand but the mueller (stainless steel one) feels more balanced and agile while the other black bladed one feels heavier and more lethal but the grip feels slippery and point heavy. Any input appreciated.