When talking about ad networks to monetize a blog, one has to consider a lot of variables before settling down with any company.
You may need to consider your audience volume, region, adnetwork reputation, among others.
In my years of experience in the blogging industry, I've tried many ad networks and many of them weren't just good for me, I found one that actually met my needs and that's propellerads so I decided to stick to them for the reasons I shall list out in a bit.


Running a blog is one of the easiest things to do online nowadays, almost anybody can learn to create a new blogger or wordpress blog in an hour and get the blogger badge on his name the next hour.
But creating and running a blog is actually the first step of a multi-step blogging process.
Getting to make money from the blog is the priority of most new bloggers and this is where most bloggers get it wrong. This is also where impatient bloggers quit (and there are millions of failed blog ideas due to low or no revenue)
I've been blogging for over four years now, and had had my own share of monetization difficulties in the most of these four years.
I'd tried virtually all the ad networks and monetization options available so trust me when I say propellerads is your best bet as a new blogger.
As with most ad networks that requires you to have a specific number of pageviews before they can accept your blog, propellerads has no traffic requirement which means you can start showing ads on your young blog.
My blog's pageviews was in the hundreds and growth was very slow, my blog already had renewal bills being paid from my pocket and Adsense wasn't any where close to the 100usd threshold I just needed an alternative and propellerads did the job for me, I could easily reach the minimum 5usd at the end of the month or week (depending on the traffic) and pay for hosting, it also helped me stay motivated, at least my blog was actually earning something.
Another thing I like about them is that they can surprise you with earnings you are not expecting, I once woke up to a 10usd earning on a 68pageviews, sometimes 7dollars, maybe they do CPA marketing too but I loved it.
Also, they have an ambassador program where you can earn money by performing simple tasks for them. You mostly have to post about them on your TL and get like 3 to 5 dollars reward.

With these and other features, I can boldly recommend propellerads to any new blogger.