High paying keyword vs easy to rank keyword, what you choose?

If you have to choose between high paying keyword vs easy to rank keyword (high volume but lower cpc) which one will you choose for adsense.

For high paying keyword of course there are seo masters that already rank for that kind of keyword. We need to outrank them first (maybe need more cash to rank the site).

But there are plenty of easy keyword to rank, but cpc low around 0.05-0.1 per click.

Which one you choose?