I think it will be a good battle between them but MM is more prone to crash than Pecco. Let's see. I don't think Martin will be a threat next year, it'll take some time to adapt to Aprilia which is a good bike but it's nowhere near the level of Ducati. I know both Vinales and Aleix sucks hard but I don't think Aprilia has the cards to play head to head with Ducati. And unless KTM does a turnaround with their bike (kinda miracle) Acosta will be out of the party, sadly. Sad momment for his career, by the way. KTM sucks. They have shown to commit the same mistakes as Ducati did between 2006 to 2013: too much pride. Pit Bierer is a morom.I will be shocked if MMarquez does not at least give Bagnaia a very very strong challenge for the championship next year. I'm entirely undecided as to which has the greater chance of winning out.
I'd be happy with either outcome. I'm not a dedicated fan of either.
Personally I tend to support the underdog. So, Rossi when he switched to Yamaha. Hayden and then Stoner for their first (or only) championship. Marquez when he was in his debut year, and later Dovi. I don't see either Marc nor Pecco as an underdog.