I read both of your links... they are quite solid.
If I were to uninstall one or the other, then avast! isn't worth considering as panda has done a considerably better job in my testing of blocking out general malware, rogue av's, and other atrocious malware (rootkits and keyloggers). Your information is good, but you forgot to research the product I was running avast! with, or you'd have realized:
1. panda doesn't "update".. it's connected to a continuously growing database..
2. There is no "sluggish performance... i've noticed that panda real time only takes effect when avast! let's something nasty in.
3. (points it out impatiently) The screen-saver scan does this, not the real time.
But i'll give your suggestion a try... i'll see if it works.