Hello silent music7.My take on this one is:Avira does generally have the best detection rate when doing on demand scans, around 99.7%.In zero day threats it only detected 71% in tests ( av-comparitives) of zero day cases, and that means it potentially lets in 29%!! to cause damage. So on this one i would go for Cis. Why?. Because it has 3 levels of protection, Firewall, Av, and the Big one here, Defense+.
Now Defense plus has in tests ( you tube for example) never let anything in to damage your computer,as long as you can understand the alert messages you receive, and then make the right decision in clicking “allow” or “block”.Therefore potentialy stopping that 29% getting in. However in the unlikely event of something getting past defense+ then either the Av or The firewall will do their job. 3 against 1 here.
Cis also has Buffer overflow protection, version 3.8477 onwards, and Cima version 4 will, and do protect like no other app in that something like 60% of attacks were buffer overflow related according to Melih ( i believe him) and i dont know of any other app that has the protection.
Avira does not have buffer overflow protection.Cima wiil improve detection dramatically and reduce false positives too. There is likely improvement in detection due in another version between 3.9 final and version 4 with engine and signature improvements which will narrow the gap detection rate wise between the two.
If its just on demand Av scanning then Avira is the choice( at the moment). I beleive this will change before the end of the year, as good detection is one thing but Avira is known for Fps and high detection rates 99% plus go hand in hand in general. A squared for example 99% plus and high fps is well known. Fps can be as damaging as spyware, if the wrong decision is made as to what to do about them.
Cima is known for extremely low fps and i reckon the combination of Cima and the planned engine/ signature changes will address the balance in Cis favour. This is just my opinion and dont expect some to agree with me but you asked for an opinion and i have given mine. 3 layers of protection against one.
I admit you could use another firewall and some other Hips type Product or behavior blocker like Threatfire/ Geswall/ or Prevx edge to cover for the inadequate realtime guard that Avira uses, but that would be using different comanies products.This would add more of a drain on your system resources and ram and most likely start up times would increase and computer slow, due to using multiple products. Comodo never uses much more than 7 mb and that is very small in comparison to using Avira on its own, never mind adding a couple of extra layers of protection seperately. I Hope my opinion can help you reach the right decision for youre own needs, but suggest you do some research.