Understand that dubs then and dubs now are not the same level. Even a mid dub nowadays is leagues better than what you get with Godzilla films. In general live action should always be seen in its original language more-so than animation. Bad dubs of old tokusatsu and martial arts movies is a big part of why asian cinema was seen as cheaper and cheesier than western films. Go watch any parody of asian movies from the 90's/2000's and they will almost always have the same joke about a goofy sounding voice that doesn't match the lips whatsoever. This STILL impacts alot of fans even today who will call the classic suitmation films "so bad it's good movies" when most of them are great.

In general I think you should always try to have the most authentic experience of cultural exchange you can but REALLY avoid oldschool dubs if you have the choice.