I asked a question a couple days ago so please let me know if I'm asking too frequently on here, I'm not sure what the etiquette generally is. In short, I'm looking to prove that for P, Q distinct points in the complex plane $\mathbb{C}$, $\mathbb{C}-\{P,Q\}$ is not conformally equivalent to either $\mathbb{C}$ or $\mathbb{C}^{*}$ (the punctured plane), and that the same is true for any domain whose complement has more than one point in $\mathbb{C}$, using typical techniques in complex analysis.
The only caveat is I hope to use this in order to show using the uniformization theorem that $\mathbb{C}-\{P,Q\}$ is not uniformed by the unit disk, so I would prefer to avoid proving this using the uniformization theorem to avoid a circular argument. Since this is homework, I wouldn't expect too much detail in the answer (unless you care to give it!), but I'm not sure what methods are conventionally used to prove 2 structures are not conformally equivalent. In general, is there any rule on a Riemann surface, compact or otherwise, which determines whether it can be uniformized by the unit disk or the complex plane? (For example, based on genus? This latter question is merely a matter of curiosity.) Could anyone help please? Many thanks in advance.