Your current setup is good enough. No need to change ZA to Comodo.
But if you're seeking to purchase an antivirus program, I would recommend either of these:
- Kaspersky - Has a comprehensive scanner but a bit of a resource hog. Recomended only for fast computers.
- Nod32 - light on resources & has fastest scanner engine. This is the one I have on my main machine
Both of the above have trial versions which you can try before purchase
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