They both work in the sentence but hope would be my choice of word.
So it makes sense now.
Muchas felicidades! Espero que te la pases bien. - Many Congratulations! I hope you have a good time.
1 more :P
Espero que te la estes pasando super padre - I do not understand why padre is at the end of the sentence. It can't mean super dad. Padre has to have another meaning.
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