This is harder than I initially though.
Kendrick has sold like 200k more than 2 Chainz, but 2 Chainz has still sold a lot.
2 Chainz played a huge role in Cruel Summer, was the main man on big hits from Nicki Minajs Beez in the trap, Mercy to biggest hooks of the year with fukking problems down to the street shyt with R.I.P., Supafreak, Bandz make her dance and not to forget his own singles.
Kendrick however dropped a classic and probably the best album in music period and sold more.
Not really killing the features on the major level, probably had the least significant verses on both joints on Asaps album, but he still had a joint in the clubs with no features on.