I think he's gotta shoot the 5. That shot has game-winning upside, and the needed stroke isn't anything special so the cue ball on the rail isn't even a real problem. If he does miss, there's a good chance of hanging the 5 with protection.
And, if the 5's anywhere near Corey's pocket, it also limits Brandon's ability to get balls uptable.
"LOL ... judging by your shot selections you play good" -- Hacker, September 29, 2015.