@sai I always go for more storage and always end up using it for music that just sits there waiting for the right time. I even had a rare 16 Gb version of original iPhone. The "oh, I'm out of storage space, I've got to delete something" moments happen like… almost never.
Pick the cheaper one. You can always sell it and buy the one with 256 Gb. The upgraded revision of the device might be out by that time so you'll just get that.
@antichrist_hater @sai Internal is faster for sure, should be UFS 3.1 or something. But unlike SD you can't replace it easily when it wears out.
@antichrist_hater @sai Same here. Flash storage either dies in the first several months or lives forever. But SSD wear isn't some conspiracy theory, it'll happen sooner or later and it still should be taken into consideration.