I advise you do not try to use ESET NOD32 with Comodo Firewall.
If you have a system image backup to revert with and insisted on it then you could try it out however remember to exclude one another through white-listing and do not try and use COMODO HIPS. In fact, even the sandbox might conflict.
IMO it is just a bad idea because Comodo Firewall isn't just a Firewall and even if you disable components, it might still leave them active but just filtered out to not do anything and that alone could be problematic if that is the case.
ESET have a good firewall though, you may as well just use ESET Smart Security but it's up to you.