Between those, the N450 without a doubt. However, I'd also consider spending a bit more and looking into something a bit more stout. An SU4100 based laptop (or even whatever the single-core version is) is quite a bit more powerful than most Atom based processors, typically has a much higher screen resolution, and is just more usable. When I had my Aspire One, I was always working around stuff because it was under-powered. With my Toshiba (SU4100 based) most everything works fine on it. Flash sites, HD videos etc.