Both are good security products, Eset is well rounded - low on resources, system impact and high level of protection. Eset updates with quick and small signatures, very good and adaptable although the GUI takes some time to learn.
Emsisoft I had tried in the past, it used to be heavy.It has a dual antivirus engine.I have been hearing now it's fast and lightweight.It has a better behavioural blocker.
So, I would say Emsisoft holds the edge here.
You can choose either of them, and remember to follow standard guidelines to remain safe on the internet.Both will serve you in good standing.I use Eset.