How to choose best channels for telegram ads placement?

Hi,
I am new to telegram platform of SMM. So, I want to know that how to choose best channels for telegram ads placement for better results?

I always look at audience relevance first. The mistake beginners make is choosing channel based only on subscriber count.

I usually focus on audience matches the product or service that I am promoting. If I am talking about best channels for telegrams ads account so according to my experience best channels are not always the biggest one.A smaller channel with active and interested members can perform much better than large active one.