Most panels are fine. There are a few main views and subscribers suppliers that most panels resell for, the main differences between them are the prices. Browse the threads advertising YouTube services, go through relevant ones checking last few pages of posts to make sure there aren't any bad reviews regarding service quality or support, compare pricing of the same views on multiple sites. For views, you need long retention (so long videos as well) to quickly hit the watch time requirement to be eligible for monetization (short videos are fine too you'll just need to buy more views). Check all of the panels with active marketplace threads here:
https://www.blackhatworld.com/forums/social-media.200/
Check the marketplace for panels that offer free credit so you can do a test before depositing any of your own money, if your budget is low. Don't trust any recommendations here, I often see replies to these threads asking for recommendations, by people promoting panels in their signatures themselves. No need to trust anyone specific as the recommendation may be by an affiliated user - you can easily do the research for yourself
You may be better off just purchasing a channel that already has monetization enabled, will save you a lot of time and effort. Last I checked, there were sellers with active marketplace threads in Social Media section for aged YouTube channels that also had some aged stock with few hundred k to low millions of views, and over a thousand subscribers each in the $50-$100 range; some of those may be eligible for monetization already. There are sellers of monetization enabled channels maybe here otherwise on other forums (prices used to be in the $100-$150 range per channel although maybe they are out of stock now). Sometimes you can get monetization eligible/enabled channels on the forum sites dedicated to account selling, for cheaper then that if the seller doesn't know that the eligibility is now a valuable feature.
tl;dr Browse the marketplace for yourself, recommendations from random users shouldn't be trusted. Review recent replies to the sellers threads and compare pricing. If low budget, ask the panels support for free test credit before you make a deposit.
