Hitman Pro and Hitman Pro Alert is like a 2 parts package. Its detection rate not well known so you will just have to trust their different approach on tackling malware. Look like Webroot rely on the rollback feature to undo malware damage instead of their detection rate and so that why they don't like getting their product tested. Webroot has good customer review and customer rating so that a good sign to make it trustworthy. PC-Mag is a good starting point for your research to start weighing but since antivirus are really hard to determine which are the better ones you have to look everywhere else to get a complete picture.