why did you decide on the Rode, have you tried it? it might work great for your voice, or it might stink. i'm not saying the 2020 will be better, just saying to include it for consideration, as i've had better luck with it (on voice and guitars).
if buying a mic for a specific purpose, especially for a specific person's voice, you *have* to try it to see if it's suitable. you can gather all the internet/salespeople opinions you want, but those are reflective of what has worked for that person, not for you.
depending on how you use the mic when you sing (rough/close vs distant/gentle), you might even want to consider a dynamic. the shure sm57 is cheaper than either of those mics, and i've gotten very good vocal recordings with it.