Midway (1976) is kind of a classic old school WW2 film. It starts with the Doolittle Raid then concentrates on the intelligence gathering and preparation for the Battle of Midway. The last half of the movie is the battle itself with the various air squadrons searching and attacking the Japanese carriers -- the movie is mostly from the American point of view. The film ends right at the end of the battle.

Midway (2019) is a big budget theatrical film on the same topic. It starts with Pearl Harbor, spends a lot more time on characters, covers the Battle of Midway in about 30 minutes, and ends when the American carriers return to Pearl Harbor.

Some comparisons:

2019 has a lot of average movie-CGI so it does look a bit off. Compared to the first movie which used real vintage airplanes (though recycled footage it's still real airplanes, 2019 you can see multiple air squadrons in the air) and actual archival footage from WW2.
The Battle of Midway is given short shrift. You don't get a sense of the battle like you do in the 1976 film. On the other hand you get a bit more of the strategic factors in the 2019 film. I also liked that 2019 had a submarine, USS Nautilus, taking a part which it probably did historically but was unknown in 1976.
The 2019 ending credits shows what happened historically for each character, which I do like. This points to the fact that 1976 has a fictional major character, his son and a Japanese internment detainee plot line.

Overall I do prefer the 1976 version.