Sasuke intended to kill Obito, but Kakashi arrived.
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This, pretty much.
He was going after the ones who ordered the clan to get assassinated.
technically, Obito was the priority. After he asked Itachi who was the other Sharingan user he says "once i'm through with you, i will kill him next". Danzo became a priority in part because he already failed at trying to kill Obito in the scene where he tells Sasuke where he could find Danzo.danzo was the priority as others have said not to mention killing obito is not a piece of cake. hes actually attempted but to no avail
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mayb if he like konan had enough intel on kamui, then he can definitely come up with a strategy but like i said danzo was the priority so there was no time for that.