The movie looks a little hokey in the previews, but Michael Medved gave it 4 stars and I'm inclined to trust his judgement. So I'll probably go see it.
The last war movie I liked was Saving Private Ryan -- an excellent film except for the parts with Matt Damon. That hyper-realistic opening sequence is incredible. It's like being there.
I recently watched We Were Soldiers and Das Boot, both of which were disappointing -- though Das Boot was just a hair away from being good. The second-rate foley work in the overdubbed version killed the vibe. With subtitles and the original sounds, I might give Das Boot a thumbs up.
Sadly, my other favorite war movies are pure leftist agitprop: Full Metal Jacket and Apocalypse Now. But both were so brilliantly done that I can't help but enjoy watching them.
Did you ever see Devils Brigade? That is one of the best ever.
As far as your two selections, may I suggest renting "Tour of Duty". It dates back to 1987, but is fairly accurate tactically (taking into account they have to get their bodies and faces in the screen), and the story lines are sometimes corny, but season three picks up a lot as they begin working with MACV SOG.
Das Boot...
Always watch foreign movies in the original. That's a rule I've learned from anime (which I like a lot).
And Apocalypse Now was a brilliant film, really entertaining. Only political paranoids (who see communists undre their beds, just like the Jesus freaks who see Satan behind everything they don't like) might find it offensive. Try Joseph Conrad's "Heart of Darkness," the book it was based on. A really great read, as well.
Have you watched Band of Brothers?