The Vatican Museums have announced there will be ticketing changes next year. I haven't seen an announcement on the Vatican Museums website, but this online article may help a bit: https://www.catholicnewsagency.com/news/255969/vatican-museums-announce-new-hours-ticket-price-and-entrance.
The Vatican Museums are mind-blowingly crowded. Even a brilliant tour guide will have limited ability to reduce the impact of the sardine-like conditions. The usual suggestion here is to choose one of the (very) early-access options that get you into the Museums before they open to the general public. The Vatican itself offers early entry with or without a guide; at least one option includes breakfast. There's an audio guide available if you want to save money.
Private companies also offer early-access tours (only with a live, human guide as far as I know). The commercial tours seem to be more expensive than the tours run by the Vatican Museums; I don't think you'll find a commercial early-access tour much below 100 euros. Walks of Italy's Pristine Sistine tour is very popular on this forum, but there are other companies in that market.
I went to the Vatican Museums in the early afternoon in March this year. They were very crowded, but I wasn't really interested in the Sistine Chapel, which was difficult even to walk through. I just took my time and was able to see what I wanted to see in the rest of the museums; some of the areas of interest to me (like the Pinacoteca) were almost deserted.
My opinion is that the unbelievable crowds along the direct path to the Sistine Chapel mean any pre-general-opening-time tour (even without a guide--rent the audio guide) is going to be better than any tour beginning after the general opening time.
Assuming you also want to see St. Peter's, you might try to find a tour that covers that as well as the Vatican Museums. As of this year, the Vatican Museums offer no such tour, but some private companies do. There's a back-door connection between the Sistine Chapel and St. Peter's; sometimes tours are allowed to go through that door. That's a huge advantage, because there's quite a long outdoor walk over to St. Peter's if you take the public exit from the Vatican Museums, then you have to go through the extremely long security line (which looked like it could take hours, but I gave up so I don't know for sure).