As has already been pointed out in this thread, these are all very different films.
AN (set in 1969) is really a vehicle through which to present the Heart of Darkness theme. It is an artistic achievement and has many more aspects going for it. Budget (naturally),location for shoot (Philippines), tech advisors, good actors, gifted director etc. Note the subtle differences in Martin Sheen's tiger stripe uniform and that worn by Sgt Oleo in GTTS. The former being proper and the latter being one of the commercial surplus store varieties. Although, it is a fact that numerous versions of tiger stripe were locally produced in VN, the most common version was that used in AN. That said, I don't think it was widely used by MAAG personnel. The general refers to it as "tiger stripe, Frenchified uniforms..." The general likely means that the uniform was inspired by the French one. However, the famous French uniform worn by the paras was known as "lizard Cam" and looked fairly different than the VN "tiger stripe" cam.
Platoon (set in 1968) has a lot of good going for it in terms of tech advice, uniforms, budget, actors etc. Unfortunately it seems to compress years worth of atrocities for at least a whole battalion into one platoon. Yes, Stone was a VN vet, but, he can still be a bit of a weirdo with a socialist's POV.
GTTS (set in 1964) is one of the early attempts at a VN film and tells the story about the period of advisors. I just watched it again over 30 years after the first time and appreciate it a little better. I was very hard on it when I first saw it. Throughout high school in the late 70s and into early 80s, I voraciously read everything I got my hands about the war. On the second viewing I've relaxed my harsh stance and try to see it for what it is. Too bad about the lousy budget -it comes across as made for TV. This is one that could really do with a remake. Aside from budget there were some very simple aspects that drag it down: mainly the late 70s disco hairdos. Typical of the 70s, actors hated the idea of getting their hair cut in a realistic style. Arrogant filmmakers, contemptuous of the audience, felt they (audience) were too stupid to notice the long hair pushed behind ears.
As for the best VN film? All vets from VN I've talked to over the years felt that Hamburger Hill (set in 1969) was the most accurate until We Were Soldiers (set in 1965)came out. WWS gets a lot of flak, but, it was a good effort. Hal Moore (the Battalion Commander at the battle) was the tech advisor. Much was done right. What helps is that both these films are presenting actual battles.
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