If not Google Adsense then what's next?

Well in the other thread of mine I was waiting for my adsense approval on a blog of mine. They rejected and I also got few suggestion on how to rework the whole thing to apply for the adsense one more time. However, it seems that it is taking hell lot of time to go through all of this process and get decent approval.

Instead, what are your second best ad networks which can pay me decent advertising revenue?

Which one are comparative and simple to integrate?

Please share your experience.

Ezoic and PropellerAds are some alternatives to AdSense, but you will need to fasten your seat belt(s) quite tight enough in order to battle with lots of bot activities in these 2 platforms, as well as other such platforms. Compared to these alternatives, AdSense is much better, even in terms of publishers inventory, AdSense is unmatchable.