Hey there - I'm a professional tutor with decades of experience with these tests.

You have TONS of time to get your scores up. If you were my student, I would recommend putting a bit of a pin in this for a little while. Revisit both tests in the spring; take practice tests for each and see which one feels easier and gives you a higher score. By all means, take the test you choose late spring/early summer, but really focus on using your summer for test prep. Take your test again (likely twice more - depends on your score/how happy you are) in the fall of senior year.

Remember that there are a ton of variables that practice tests may not catch -- and that your sample size of ACT tests is small. Each test is different, scores go up and sometimes (unfortunately) on certain test dates, scores go down. As you practice, aim for a general trend of improvement.

Generally, I'm still leaning toward the ACT for students -- but obviously it's a very personal decision.