 If you liked
Shinseiki Evangelion
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 ...then you might like
Shingeki no Kyojin: The Final Season
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If you have watched Shingeki no Kyojin until the end you'll know what happened after the simple season 1 days and how it turned out s3 part 2 afterwards, then you might like Neon Genesis Evangelion in the beginning it's a normal mecha anime, until things spiral down to a rabbit hole just like Shingeki no Kyojin, and vice versa honestly recommendation work both ways.
note: It'll confuse the hell out of you