I can't tell you much.
I do remember downloading/trying the Panda product a few months ago (for familiarity) but I came away unconvinced that it was anything special and I had no trouble removing it.
Re your question about Eset...all personal opinion/preference, IMO.
I don't believe in paying for AV/firewall/software...where free products allow me to accomplish my goals. I believe many free products are just as effective as their priced counterparts, but the priced counterparts are usually acquired by users who don't seem to think as I do.
The utility of any AV program...relies upon the user keeping it updated on a regular basis. My AV will update daily, so I don't believe that updating it weekly/monthly, etc...is going to cut the mustard.
From what I've seen...my strategy works. I don't get infected and I don't have system problems related to malware. That's my goal.
FWIW: Gizmo's - Best Free Antivirus Software Gizmo's Tech Support Alert - http://www.techsupportalert.com/best-free-...us-software.htm
I use Avira Free...and I have tried earlier versions of many of the other (paid and free) AV programs (Comodo, NAV, Panda, et alia). Some of these may be superior in some way today...but I cannot argue with the success I have with Avira Free.
A typical way to effectively remove remnants of programs...is to reinstall said program and then either remove it via Add/Remove Programs...or use some utility like Revo Uninstaller - http://www.revouninstaller.com/
. I've never used Revo...I can get rid of anything that leaves remnants (if I choose to) but there are many users who use it with satisfaction.