So much of this depends on what else you would do - you describe Option 1 as 4 courses, while option 2 includes 3 courses and a self-study for AP stats. Is there a difference in who would be teaching you?
As a former math major myself, who raised math lovers who have far exceeded anything I did, when giving advice on math selection, I try to turn the question around - what do you expect to accomplish with either approach? S always appreciated the math theory more than D, who is kind of bored with the more abstract stuff but finds the mechanical/computational stuff fascinating.
In reading your posts, you state your goal of taking the most advance course available to you - but you don’t say why you want to do this. As a HS soph now, it sounds like you are capable of handling the advanced work - and good for you, that is a feather in your cap. But if you never learn to think about the why - and their is nothing wrong with learning for learning’s sake - I daresay you might not get as much out of the experience.
You haven’t live long enough to forget any of the school work you have learned so far. But trust a middle aged woman, you will forget a lot of this over time. What you will remember is whether or not you had average, good, or great teachers, and how they make you feel about yourself.
I appreciate you wanting to challenge yourself , and understand you are great at and you love math. Math people are good at figuring out how to solve math problems - but this is not a logic problem, there is no single right answer to what is better. This is an evaluation problem, and you have to come up with the method to determine what is best for your situation, considering the variables you know and understand better than anyone here. You are asking what is more challenging, and when it gets to this level, the honest answer is option 1, 2, neither, or both.
If you are posting here at CC because you want to know how college adcoms will look at you in a couple of years, the answer is truly that whatever you decide will be viewed as amazing for a HS kid. Think about what miniscule fraction of a percentage of applicants are able to have either of these options. Wait, since you haven’t had AP stats yet - you may not know the answer. It is a very very small number. But despite how impressive it may be, it won’t be enough on its own to assure you automatic acceptance wherever you want to apply.
Best of luck to you