A master cylinder brace will provide the highest improvement of brake pedal feel.
Next would be the Stainless Steel Brake hose.
Although pads make a difference, it won't make as big of a difference as the above listed parts. Semi-metallic brake pads will likely provide the stiffest brake pedal feel.
"Why would I want to profess my feelings for some 3D girl?" - Tomoya Aki from the anime Saekano