[Q] What is the difference in Miro, Tipo etc topic

Hi guys I have an old Miro that picked up for the wife that needs a new install on it. As I have always used Omega roms on my SGS 3 I am new to the Xperia line up.

I have an Xperia Miro ( st23 ) but I am confused between all this miro, tipo dual j e stuff.....could some one please explain it to me so i know what to grab and not birck the phone.

Thanks in advance :)