This sums it up. Floyd's undefeated and always fights top competition. Always.
Pac's "resume" is full of fighters with marquee names who are 1) over-the-hill, 2) coming off consecutive losses/poor performances, 3) fights take place at disadvantageous weights/catchweights. Pac's opponents to whom this applies is: DLH / Hatton / Cotto / Mosley / Margarito
. Basically the very reason Pac became a marquee name himself was wins over those guys. They were very, very mediocre wins considering the circumstances.
Floyd on the other hand fights them when 1) they're undefeated, 2) coming off big victories, 3) at their desired weight/on their terms. Such fights include: DLH / Hatton / Mosley / Ortiz (coming off best win) / Cotto