It's only a curiosity. I think WW cases have a reputation for thinner walls, resulting in very slightly more internal volume. This is not a big deal. If you like your Remington, you can keep your Remington.
No, really. the difference in case capacity is way down the list. I haven't shot 270 for quite a while, but the difference could come down to serviceability. Meaning, how many cycles do you get before trimming to length, split necks, enlarged primer pockets, etc. Cost is also a factor.
I would not decide to purchase a particular brand of cartridge brass based on internal volume. BB