Should I take AP or IB?

Hi! I'm having a dilemma between choosing IB or AP. I want to know which one is better for University Applications. My school only allows up to 4 APs each year (including Seminar/ Research) in junior and senior year, and I have only done 2 in my sophomore year. In addition to the 4 APs, I can also take SL English. I'm applying to the US, and I was wondering which pathway to take. I am not interested in doing the AP Capstone as I don't want to waste an AP slot on seminar/ research. Also, is it too little if I max out with 2 APs in sophomore year, 4 in junior year, and 4 in senior year?