Comparison of excellent quality vanilla vs excellent quality chocolate should leave you with the takeaway that both are excellent. you may have a preference for one over the other but that’s hardly objective
My personal preference shifts based on mood and (more so) based on quality. Excellent chocolate bar vs budget ice cream that uses vanillin instead of actual vanilla beans? Probably the chocolate unless I’m searching for that nostalgic artificial vanilla flavor. A shitty chocolate snack cake with like 2% actual chocolate and 98% palm oil vs a well made panna cotta? Going vanilla.