Revenge plot galore, great productions, great acting (personally like Nirvana in Fire a bit more because it felt more cohesive and Hu Ge was an amazing actor... however, same can be said for luo jin in The Princess Wei Young)
The romance in nirvana in fire is more toned down than in WeiYoung. Both are highly recommended if you like smart heroes/heroines, political drama, and revenge

Both tell the same (kind of) story but the 2006 version is soooooo much better! Liu Yi Fei as Xiao Long Nu is an infinitely better choice of casting than that Michelle girl. The 2006 version is so heartfelt and addicting and Huang Xiao Ming (especially in the later episodes) is the perfect man for Yang Guo.