SAT Prep or Fine Arts Credit?

Hi I’m new to CC but anyways here goes…
My high school requires one full year (meaning one credit) of a fine art, this includes band, theater, music theory, whatever. I am going into my junior year and (stupidly) haven’t taken a fine arts class yet.
Some friends advised me not to take an art in junior year because “colleges only look at junior year and taking a 4.0 class (we are on 6.0 scale) will lower GPA etc, etc” and instead to take another AP class or to take an SAT prep class.
I’m really considering taking the SAT prep instead of an art b/c I know outside test prep gets very expensive…
So what do yall think? Should I take art junior year OR push it back to senior year (or the summer before senior year?) and take a SAT prep instead?