Hard to tell Chisora's peak. Chisora eventually would get chopped down by Tua's left hook and Chisora isn't a good enough boxer to outbox Tua, plus Tua had a great chin. Tua late KO in a competitive fight like the Chisora V Whyte rematch.
If i recall correctly, Chisora was ko'd by both Whyte and Haye's left hook. Tua has a better left hook than either of those guys. So i see Tua ko'ing Chisora in 6-8 rounds.
Another vote for Tua by KO. If it's any consolation for Chisora, he would win the talking war and press conference before being put to sleep.
Chisora probably slaps Tua at the press conference and Tua's built up rage would've sent Del Boy to the ER