Narrow is good and the +30 fps difference in the I400 is not a game changer. The 370 will shoot a 435 gn arrow 350 fps, which is a good hunting speed. Optic, trigger, rail, cams strings and cables are all on par with each other. I'd go with the slim lightweight myself.Glad you all posted this. I'm about 4 weeks away from buying either the Wicked Ridge 370 or 400 but for sure have to have the Accudraw. 370 more expensive but thinner and maybe 3-4 ounces lighter. Other than, not sure of any other differences.