I'm gonna be completely honest here, man. If you don't have prior experience, aiming to create "the best" is just stupid and arrogant.
There are some colossal contenders out there with which you're trying to compete. Games made by one single dev as well, not to mention those made by teams of experienced people. And there's also to take into account the fact that adult games are just games with adult content. That means that there's A LOT of different genres and different factors to consider when talking about "the best".
Now, I can understand trying to do "your best". And some great indie games did take several years in the making, despite the protests. But using that as a reference to shield yourself, that's inexcusable. Just because others did it doesn't mean that if you do it you'll achieve the same result. How are you going to respond if your endgame product doesn't meet your astronomical expectations? How much would that deflate your ego? Would you fall into despair? If so, that's a big risk to take for such an unpredictable outcome.
My sincere advice is to lower your expectations. Don't stop chasing your dream, but start by setting realistic goals. And aspiring to create "the best" from the get-go isn't realistic at all. It's a huge mistake. And you know, you should aim to learn through making mistakes, but better to make multiple small mistakes that can be corrected later, than one huge fuck up from which there's no return.