Of course the best way to discover a best performing mobile banner CTA is to test, test, test. However I just want to start a conversion about CTAs as for the time being, I'm keeping my CTA constant and only testing out headlines. I want to keep my split testing simple in this preliminary stage.
I've went for [Click Here] even though mobile users are actually tapping. I thought that if the user sees a familiar phrase, they'll instinctively know what to do.
I wanted to go for [Tap Here] and most likely will try this CTA in my next stages of testing.
Also, I just ran a "Top Ads" report on WhatRunsWhere. Out of the top 15 ads, we have the following CTAs:
I think the only way to definitive tell what works is to run 2 banners with exact same colour, text, graphics, etc. Only change "click here" and "tap here" and see what gets the higher CTR and there you find your winner 