Which 5* to choose with my roster?

I was leaning on Okoye in much the same way, and I started really trying to build her up once I realized what I was missing. the difference between that build, and a near champ/champ okoye is pretty wild. I'm about 20 Shuri shards away from finishing my 5/5/2, and at lvl 435 it starts to work very quickly. I really wish I'd committed to only spending into Latest a long time ago, rather than when Kingpin landed. I missed out on pretty much all the truly good 5*s getting better odds lol.