>>24458172It's a false dichotomy. LLPSI tries to teach the grammar primarily through the Latin readings in the text, concluding with an explicit presentation in Latin of at least some of the grammar from the chapter. There are also two accompanying volumes (the Latine Disco and the College Companion) that explain the grammar in English. You can use LLPSI as your main textbook without having to supplement from Wheelock's. On the other hand, if you use Wheelock's first, the big problem is you get relatively very little practice actually reading Latin. For that reason, many people who have started out learning Latin from Wheelock's (or similar textbook) have found that LLPSI is helpful as a supplemental reader. That's probably why the other poster recommended using both. I don't agree with that advice, however. Just stick to LLPSI for your main text. If for whatever reason you find you don't like it, only then switch to another text and use LLPSI as a supplemental reader.