Shama-il Tirmidhi Chapter 25, Hadith Number 20 (162).

Abdullah bin, Ja’far Radiyallahu ‘Anhu says: “Rasulullah Sallallahu ‘Alayhi Wasallam said: “The best meat is that of the back portion.”

Commentary.
There is no contradiction between this and other narrations in which it is mentioned that he liked the meat of the dhiraa portion. Due to different reasons and the quality, both can be good. For example, strengthwise or it having less fibre, more fat etc. Therefore due to different aspects, both could be preferred and also be excellent.