Unless you know enough Greek to get into serious depth, Oxford's Complete Works of Aristotle, edited by Barnes, is the standard thing scholars use.

Penguin Classics edition of Nichomachean Ethics has a great introduction and is very readable.

I know you've only asked for a translation, but if you are interested in more, there is an edition by Oxford University Press (April 11, 2002), 480 pages, ISBN 978-0198752714. An English translation by Christopher Rowe that strives to be meticulously accurate yet also accessible. The translation is accompanied by Sarah Broadie's detailed line-by-line commentary. https://a.co/d/4bOuqI5

Copying from an online review (at random): If you want only a translation, and quality doesn't matter much, this translation will probably be too expensive for you. However, if you want an extensive introduction (a historical one from pg. 3-7, a philosophical one from pg. 9-91), outlines on each book and commentary (pg. 261-452), a list of Greek vocabulary (pg. 453-5), a bibliography, and index, then this is your ticket.

A recent translation by Bartlett and Collins has extensive notes and reflects up-to-date scholarship. https://press.uchicago.edu/ucp/books/book/chicago/A/bo113934...

The best comes from Hackett publishing.

This fall, I read a (fairly new) translation of The Eudemian Ethics by Anthony Kenny, in the Oxford World Classics series. It is handy (fits in a coat pocket, depending on your coat), with a useful introduction and notes.