It is better to make stickers for telegram, because people more likely use stickers in telegram and for sessia it is only another feature, but the main goal for people in your app is making purchases, not chatting
I think by and large people look at the product and not on the stickers, though I myself use them. The main thing is to develop the product, release the news and then the community will understand that the command came with his project for a long time.