Since AVAST Internet Security is a full-fledged security suite, it, unlike Emsisoft AntiMalware, comes with a firewall, sandbox, router/DNS prot, anti-spam, etc. However, Emsisoft AntiMalware for not being a full security suite holds its own with its behavior guard, surf prot, and real-time malware prot. Emsisoft AntiMalware runs faster, but again, it has less features. For me, the Emsisoft UI is less clunky than AVAST. Emsisoft's signatures are top-notch, and AVAST from the results I've seen in the malware hub, have improved. If you take full advantage of all AVAST's IS features, you overall get a broader set of protection. You add Emsisoft's firewall into the mix, it becomes a closer battle. But for this poll, AVAST IS takes it. In terms of personal preference, I'd probably go with Emsisoft and add an anti-executable like NVT Exe Radar Pro or APPGUARD and feel safer than AVAST IS.