Choosing between Smart & Non Smart LED TV in budget segment

I am looking for Android LED TV. Budget is Rs 20000. My main concern is most of the budget TVs have only 1 GB RAM. Is this enough for lag free operation in basic usage? Even smartphones require 3 GB RAM minimum for smooth functioning if basic operations right? Motorola ZX2 seems the only option with 2 GB RAM. But it is not available in my location.
Is buying a non smart TV & adding a streaming device a better option than a smart TV with 1 or 1.5 GB RAM?
What are the options to consider here?