You might need to do a search on that, but I have always heard that the text ads actually have a higher CTR.

I though rich media help to earn more as compare to text ads.

Always use Text Ads, In the Article...

Preferably i will use the text ads because it will also increase the traffic when users will find the relevant sources from my website.

I think you will find the majority use text ads on their blogs, but i have seen my fair share of banners around too. I'd suggest just sticking to text ads as you'll also be getting more options i.e- say 4+ ads in the space of 1 rich media ad. Correct me if i'm wrong as i don't use adsense but that is what I'd assume would be a big point to consider.

I use text ads and make the text same like article's colour... Probably you can use rich media at the header..

I think it really depends on a few things

-The niche
-Site layout
-is your content all words with no images, images with no text, text with one image per post, etc
-ad placement

For example, I have had several sites (I have recently downsized to be more effective) and when I build up a site, I usually start with text/image for all ad placements and try to learn how the ctr plays out after a few months. After a few months of clicks, I will usually switch to all of one or the other to see what happens to my ctr and then adjust from their. Most of my sites have image ads in one area of the site and text only in other areas of the site, while my highest ctr is from an all text site that has text/image in all ad placements. The tricky thing is to switch up your coloring for about three or four prime days per month to grb ur average users eye more and entice some extra clicks, then revert back to your standard text colors. That's just my opinion though. And that last strategy only works on a site that gets frequent return visitors. I also haven't had much luck trying to "blend" my ad fonts in with the colors I'm using in my content colors......I use blue titles for everything....and on one of my sites I'm getting a 18% CTR and another I'm getting a 13% CTR.......however on my two USER GENERATED CONTENT sites I'm only getting about 2% CTR. You just have to adjust....leave it for z month or so (depending on the traffic u r getting daily) and then adjust.....wait and repeat....wait and repeat....its a pain in the ass.....BUT WORTH IT IF YOU WANT TO BE SUCCESSFUL.

Actually Text ads look like the part of the page contents or an article and so its CTR is high. Reader thinks it to be the internal link inserted by the writer. Concealing the text ads between the copy text really makes much money.

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Opportunist86.....as I stated in my response, and as jerome15 pointed out....it depends on your site. If u notice a majority of the previous responders to your thread mentioned that text only ads were best and Jerome mentioned that his ctr increased with image ads. Every site is different. Experiment and study....experiment and study my friend....that's what its all about.....and eventually you'll find that sweet spot!

you can use some analytics tools to check which ads drive more revenue.

For iphone i use iEarnFree. You can try. it is free.