It's not a presidential election. We're not voting for Corbyn or Johnson, we're voting for their parties. After the last 9 years of the Conservatives being in charge, I judge them guilty of ideologically imposed austerity (counter to the usual recommended economic response to recessions) and for imposing the Brexit shit-show on us all.
For that reason, I'm voting Labour.
If, in 5 years time, Labour have delivered on all the catastrophic predictions of the 'anyone but Corbyn' brigade, I'll be voting a different way, of course. But for this election, it's a no-brainer.