I'm infinitely more interested in WW84 and Shazam 2 than any of these but of these, it's definitely the Batman. I'm a bit tired of Batman being the centre of DC but it has a great director and a great cast, finally tackling Batman as a detective.
Flashpoint... I mean, who's even writing and directing this film? Is it ever going to actually happen? Are they really going to spend millions of dollars on a film that is just an excuse to reset continuity? Also, it was a stupid story in the first place (Thawne going back in time to Kill Barry's mom, no issues with the time stream, Barry going back to reverse that, everything goes haywire - can't fault that logic!) so do we really need another bloody iteration of it?
The Snyder Cut is gonna suck. I see no evidence whatsoever based on Man of Steel and BvS that it will do anything but.