if i have to buy one of them, what should I choose please?
Get Avengers: Endgame to complete the collection with Avengers: Infinity War. Having said that I didn't mind the 3D in Captain Marvel but as a standalone film it doesn't really compare in the grand scheme of things with Infinity War & Endgame. (Or be like me and buy both, but I'm assuming that's not an option).
I too would say get them both. Both have great 3D and Captain Marvel got to keep the IMAX scenes on its release. Some pretty stunning moments in space when they widen the ratio. Still you have Avengers: Endgame that wraps pretty much everything up, and Infinity War has a stunning disc and would expect no different with Endgame. Both I liked in theatres but IW really blew me away on disc at home on my projector setup.
My DVD Collection
HOME THEATER: JVC NX7 4K Projector, 106", Oppo-203 (Region Free) Sony 55X900F 4K/Dolby Vision , Marantz sr7010 in 5.2.4 Atmos/DTS:X
Still you have Avengers: Endgame that wraps pretty much everything up, and Infinity War has a stunning disc and would expect no different with Endgame. Both I liked in theatres but IW really blew me away on disc at home on my projector setup.
That's what I was thinking. If you have Infinity War 3D why wouldn't you get Endgame 3D? They're a pair so having just one or the other doesn't make that much sense to me.
(Of course, if you have OCD collection anxiety you'd get all of the films in 3D that were released, I note Marvel/Disney is re-releasing the films 4K but it's not quite as compelling as 3D I think).
If I had to choose, I'd go with endgame. It has larger battle scenes for starters. The 3d is excellent (far better than the Infinity Way 3d release).
I would think that if you're doing a movie showing, that 3D endgame would also be a larger draw than 3D CM.