A good call to action has a clear message and action. It should move people in the direction of purchasing. On a blog post, a good CTA may point people to more in-depth content like an e-book. It can also point people to your products and services. However, the in-depth content is more effective. You can then pitch your product or service using the in-depth content.
Google has the larger market share by some way (in the UK it holds 98 per cent of the mobile search market and 90 per cent across all platforms) so it’s fair to say there is potential for more eyes on the ad. Bing’s interface is also less swanky than that of Google’s but, as mentioned, it’s worth giving Bing a shot and enabling yourself to be in two places instead of one.
At our agency, we work with sites of varying sizes, from very large to quite small, and recently, we have noticed a trend at the enterprise level. These sites aren’t relying as much on Google for traffic any more. Not only are they not relying on Google traffic, but also, the sites are getting less than 10 percent (or slightly more) of their organic traffic from the search giant.