its very difficult to say which one is the best for what rom/android version,its best to try and see/test yourself
1.Mother of All AD-BLOCKING from xda member BSDgeek_Jake
bsdgeek s thread<----CLICK HERE
its contains a very detailed explanation what and how to
2.adaway its a apk just install like a normal apk update and follow the instructions
adaway2.8 download here---->http://d-h.st/Dsv
the official site its here--->adaway official site<---- here there also is a link to fdroid where adaway is also available
3.adfree its a apk and can also be installed as a normal apk/update and follow the instructions
adfree download here---->http://d-h.st/jrN
the official site can be found here and there you can also get the download adfree official site<----
4.[Xposed Module] Xad presented by XDA Senior Member DragonHunt3r, who created a module to block the Google Ads API. With this module, you can get rid of most ads seen on your device. Installation is really easy. All you need is root and the latest version of Xposed Framework.
original thread DragonHunt3r s thread<----CLICK HERE
5.adblock plus(also called ABP) its a apk and can also be installed as a normal apk/update and follow the instructions.
ABP download here----->http://d-h.st/q3f
here is the original site here you can also get the download ABP thread<----CLICK HERE
6.lucky patcher its also a very good addblocker,but i can not put a link here because i think its forbidden,because it can do more then just blocking adds,if you wanto try it just use google
7.[Xposed module] MinMinGuard . It can completely remove both the ads inside apps and the empty space caused by those ads. Conventional ads removing apps are only able to block the ad content, but the space taken by the ad will still remain unused (black). MinMinGuard successfully removes that black space, which extends the app window and makes your user-experience better.
All you need is root and the latest version of Xposed Framework
the official thread can be found here,with a very detailed what and how to------>MinMinGuard thread<----CLICK HERE
i think i mentioned the 7 best addblockers+...ofcourse dont forget your phone needs to be rooted
and dont forget the thank/donate the original creaters!!
if i forgot mention a adblocker or/and a thread please let me know and ill add it here
and ofcourse youre findings good or bad with a specific blocker can be shared here just post it!!