I wish to share my recent experience with you to possibly help. I am an average home user with reasonable (but not high) technical background in computing.
I used Kaspersky internet security 6 years, I had not had any bad experience with software/internet protection. Being honest I was a little disappointed with their response time to system problems created by their software (I do understand the complex problems of modern AV products and I do not expect any vendor to be perfect) .
I monitored forums for the last year while deciding what to change to. I am very happy with every aspect of ESET internet security so far. The setup was far easier (IMO of course). I did some basic test to ensure the software found some PUP's I new were in old backed up software (this is a setting you turn on yourself just like KIS) and ESET worked perfectly.
One item I think you may find very different is the non use of browser "add-ons", I personally like this as there are useful additions to use in the browser of your choice that accomplish the other vendors add-ons. Allowing more flexibility as I see it, as an example I am using U-block in my browsers now.
The Banking and Payment browser is outstanding, I generally use Firefox and you would recognize the same basic concept as KIS but in my opinion a bit easier to use.
As properly indicated by the other posters both software's are very good, I wanted to give you an experience from someone who has made the switch very recently. Keep in mind you may trial the software for 30 days to see how you like it, I did just that and made my purchase the same day I loaded the trial.
The very best to you in whatever you decide -- ebill