Biggie's lyrical ability was FANTASTIC. Try finding rappers nowadays who can use inter-line and multi-syllable rhymes like he could. You need to listen to his two first albums. SOOO good.
Except for the fact that he has a totally different lyrical style, since he's a way better lyricist, and talks about the streetlife, not so much about worldly problems and politics, until. Overal Nas is a way better MC than 2Pac, and best comparable to Rakim.
This is a link to a mixtape of 2pac vs. Biggie, I noticed your picture and thought you might like it.