Recently using MIUI 5. Then I personally feel that it has more features that I like comparing to CyanogenMod and Namless ROM. In my opinion, the worst is Samsung stock ROM. Because it has a lot of unnecessary apps.

Previously I used CyanogenMod, installed it in a Samsung phone. It is clean and rooted and busyboxed. That is why I can enjoy the power of root.

Due to another device not supported by CyanogenMod, Nameless ROM was installed. In my opinion, Nameless ROM is very similar to CyanogenMod, just it is less popular and under development stage. Yet it supports some devices not supported by CyanogenMod, such as Samsung Galaxy Tab 10.1.