I have used both Japanese-keyboard and US-keyboard MacBooks—I switched from Japanese to US a couple of years ago because I was buying second-hand in Canada. I don’t think it makes much of a difference. I would choose the keyboard layout that has the special characters (*, #, @, etc.) in the places you are most used to, or the keyboard layout that is easiest to buy in your location.
On the Japanese keyboard, there is key to the left of the space bar that allows you to switch between inputs. On the US keyboard, I press Command + space bar to switch between the current input source and the previous input. You can easily choose your own shortcut via System Preferences -> Keyboard -> Shortcut -> Input Sources.
Hope that helps,
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