Manga.
More often than not, the anime adaptation botches the original work, and it's a trend that happens waaaaaay more often nowdays.
Of course there are outliars, like Dragon Ball where the anime followed the manga consistently with some filler here and there, but the filler was nice and didn't disrupt the overall flow of the series, and a more recent example is the netflix anime adaptation of the Ultraman manga, the anime adapted the manga until a certain point, and from there they did their own thing before ending the anime on it's third season by 2023, it's pretty good I recomend it.
My rule of thumb is this: If an anime is an adaptation of a manga, read it. More often than not, the anime only exists to promote manga sales, that's why many get cancelled after a season or 2, you are supposed to buy the manga. If the anime is wholly original, then ofc you should watch it, they don't need to rush it to meet the manga quota.