i suggest you go with Kmeaw's CFW because it is the best for 3.55....and if you want to play backup games i suggest Gaia Manager and Multiman (latest version).......

kmeaw is best in my opinion Link-- You must login or register to view this content.

Multiman is 1 of the best Link--You must login or register to view this content.--U need full/base version installed first the just updates after that.

ALso best thread for Homebrew N Alot More--You must login or register to view this content.

If you want a bunch of advanced features use ReBug, if you want it safe and simple use Kmeaw.

As all of the above posts stated.
Kmeaw would be the best option IF you are a basic / normal user for the Jailbreak functionality.
Eg just playing backups etc.

Rebug offers more features, such as some advanced debug features, which for the normal users would be useleses.

So if you just want to play backups, Kmeaw, if your a DEV, Rebug.

I prefer Geohot since its barely recognizable and its easy to use...if you want to be a pirate :p then use kmeaw... no need for rebug