Which ticket for Borghese Gallery?

I'll start with a disclaimer - I always do my own preparation for sites I visit. The only tours I take are those sites that do not allow an independent visit ( Municipal Building in Prague , School of Art in Glasgow . are two examples ) Get a straightforward timed entry ticket ( you will have two hours ) be there early so you can be on the entrance queue when the doors open , have your guidebook , and Above all - watch this documentary at least once ( several times would be better ) before you go . The Bernini marbles on the ground floor are the stars here , and having a background of them and their creator , Gian Lorenzo Bernini , will give you more depth and understanding than a tour guide - https://youtu.be/dJsD8mmWjM8

There are not really a "zillion" choices, and the "company" you should purchase from is the Borghese's official ticket seller:

https://galleriaborghese.beniculturali.it/en/

This is the actual ticketing page for the museum:
https://www.tosc.it/en/artist/galleria-borghese/

You will have to choose a specific day and open time slot, and your visit will be limited to 2 hours. If you wish to visit with a tour, here's info what's available through the museum itself. Unfortunately, they offer them on limited days/times but you might be able to make one of them work:

https://galleriaborghese.beniculturali.it/en/visita/visite-guidate/

The website says "Audio guides can be hired next to the ticket office, at a cost of € 5.00."
https://galleriaborghese.beniculturali.it/en/info/servizi/

I would assume they have them in English but you could ask them? For emailed questions:
https://galleriaborghese.beniculturali.it/en/info/

Everyone's preferred method is different. We bought a book in the museum bookshop before our time slot. :O)