Even if I only played the midway back in the days, I much prefer the TAITO which is really attractive with its more detailed design, everything is fully decorated...
...and is the original versio, the one that started the craze in Japan!
+ it's also more difficult to find than the midway which makes it even more desirable.
Both have that fantastic backlit moon (and there is also a button version of the Taito but I like the Joystick version better).
Do I sound sure of myself?

weeeelll, because to tell you the truth, I have the Taito version, the "The Invaders" Zacc version and if ever a nice midway version happens to cross my "arcade quest way" at some point, let me tell you that I won't turn it down

I would love to ultimately own all 3 versions and line them up because imho every serious gameroom needs a good amount of squid shaped invaders.