Describe your 'tests'.
I've done a little unofficial testing myself, with trojans/worms, packing them, etc.
In my test of 125:
F-Secure: 125 detected, 0 suspicious.
Avast: 104 Detected, 0 Suspicious.
KAV: 125 detected, 0 suspicious.
NAV: 106 detected, 3 suspicious
McAfee: 121 detected, 0 suspicious
AVG: 93 detected, 0 suspicious
RAV: 110/125 by sig, 1 heuristics
Panda: 103 by sig
GAV: 115 by sig
F-Prot: 61 by sig, 34 Heuristics
I'm VERY VERY impressed with Avast's ability to blow the free AVG way,and manage to keep up so closely and surpass some top dogs...
But if you are really looking for Malware/Trojan detection, nothing beats KAV/F-Secure