^^ this
Wall-of-weapons rammers are built for attrition wars, or as a standard rammer design. Concentrated rammers are built for huge hits and going through HS's defenses (more prevalent in stock where you have several spinners on your bot)
You also have V-rack rammers which are built for pinning stuff.
I find concentrated rammers to be more difficult to build and to make effective since you need side armor and you are far more easily knocked to te side.