Correct me if i'm wrong, but I dont think there's a a8 5500m. There's a a8 4500m, to which a basic comparison could be found here: http://cpuboss.com/cpus/AMD-A8-4500M-vs-AMD-A10-4600M
Like tiny voices said though, it depends on what you're using the laptop for. The a8 would be perfectly fine for browsing the internet.