I went with Guardians 2 as the number one pick. As I recall, when the first movie was out, it was doing really well at the Box Office. BnM kept posting all time about its haul. Plus, with it's select soundtrack, it got people talking a lot about the film and created more buzz for it. It seems to have made a pretty good impression with a majority of people who've seen it than some of the other film properties so I think a lot of people are going to be want to check out this sequel.
I went with Spiderman as number 2. Even The Amazing Spiderman movies did big box office business despite people not liking them so having Spiderman in the MCU should draw in more people who may have skipped the Garfield affairs but releasing in the crowded summer time could cut into its box office a bit with another Planet of the Apes and Nolan's Dunkirk as a couple big films releasing close to it whereas Guardians will have relatively weaker competition to face off against much like it did in the month of August when it was released a couple years ago.
Much still depends on the finished product and how well it is reviewed but going by the trailers, G2 looks like it will be able to match the effort of the first one again but Spiderman's trailers haven't really pumped me up or sold me on yet. But that's just my take.
Really, everything else on the poll is kind of wait and see for me. I admit I've got some interest in Wonder Woman but that's primarily because of its odd World War 1 setting and I'm curious about the Dr. Poison villain though I believe I heard she isn't the main villain. I'm more curious to see Ben Affleck's take on Justice League when it releases. His bummed out expressions from BvS are still classic and now he seems to be trying to get out of playing Batman anymore so maybe he is trying to distance himself from the DCU on the fear it could be damaging his career again. How much is he going to embrace the release of Justice League?