There's a lot of factors to take into account. The first thing to realize is that in most industries, 20 unique visitors a day will not generate much income.
If I were you I'd work on getting the site a lot more popular before you use Adsense on it.
I "believe" that getting links to a site is a lot easier for a website without ads. Sites with ads have a harder time in getting links in the early days because it can be harder to get links if your site if concurred commercial.