As far as Brexit goes, would Corbyn really be better than May?
Allow May to continue being a horrid PM and the Tories will no doubt be giving up whatever level of popular support they now have.
It's not Brexit so much as the rest of Labour's policies. How well do you think Corbyn and Trump would get along? Admittedly it can't be much worse than his relationship with May, but Corbyn stands against just about everything Trump stands for.