It depends on several factors: your needs, your wishes and your habits, also the complexity of the text.
Say, if it's a standard book in English, maybe a machine translation will suffice. I usually read quite long pieces of text in computer Braille (because my knowledge of English Grade 2 is crappy) and it's OK.
However, if you want to either read something fancy like well-formatted poetry, or texts with citations in different languages, rare in particular (Judaist or Christian texts with citations in biblical Hebrew or koiné Greek, texts about Hinduism with citations in Indian languages like Sanskrit, texts about Native American cultures, again with citations in various languages); fancy…
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maths; music Braille or texts with musical excerpts; or you just want to get aesthetical pleasure from reading properly formatted literary Braille, — in those cases transcription is mandatory. Also, there are some languages (like German or Russian for example), where machine translation doesn't achieve higher levels of accuracy. #Braille