That is a tough decision because as you said Artur Beterviev has a 100% knockout rate and chances are good that he can continue his streak but Joe Smith vowed in the past few days that he will end Artur's KO streak, so my guess will be same as you, the latter will go fighting while trying to survive Artur's ferocious punches. For now, that will remain a question until the announcer announces who will win the fight later but you might be right and the odds to win by decision are tasty too.
The thing is when Beterbiev haven't worn any single belt where he's a challenger at that time, he can beat both Enrico Kolling and Oleksandr Gvozdyk via KO. While both of Kolling only lose via decision and Gyozdyk is undefeated, but Beterbiev can prove his power is enough to KO a champion. Joe Smith Jr ever lose via KO on 12 years ago, but it seems unrelevant now and he only lose via decision when fight against Bivol.Bivol is a power puncher but Joe Smith Jr can still survive for 12 rounds, but I'd think Beterbiev have a higher strength than Bivol.
the odds was really against him and that fight were almost cancelled or postponed because of the tension in his country against Ukraine but eventually the match was continued as scheduled and he even won impressively against Canelo which many of us haven't expected. Bivol indeed proved that he's worthy!