The OVA version IMO. It's like watching four mini-movies that way and was how all four were originally created to run. Also, I think only the OVA version has been dubbed, so that's another reason to go with that if you prefer to watch with the dub too. Then you can watch the movie which is available both dubbed or subbed.
If you really like the OVAs a lot, and want a little more before watching the movie, you can watch episodes 9-10 of the series version (Alternative Architecture ep 9-10, Pyrophoric Cult Part 1 and 2), which were newly created at the end of the TV run to further improve the flow of having the series smoothly flow into the movie with an extra story, though I'd say they are not completely necessary to watch and still enjoy the movie if you just want to get to the movie faster, since I originally saw the movie only after seeing the 4 OVAs. And didn't know about those two new eps until later.
You could think of ep 9-10 as "Border 5". But since those two eps haven't got a US blu-ray release so far, I think just like the rest of the TV series version it's only available subbed on the Funimation stream.
https://www.funimation.com/shows/ghost-in-the-shell-arise/