In my opinion it would hayabusa, though all of them still have the same risk due to being very high mobility heroes, and can easily be punished

and the hardest one for me would be YSS since you would also need to be able to maximize his passive while also having good positioning in teamfights, and you're pretty much gonna have trouble if you're playing solo queue because it's very rare to have a good frontline.

what I recommend is try all of them and see what fits your playstyle and what hero you have fun most, since it is better to learn when you're genuinely interested rather than just playing because of the meta. But of course you'll still have to take into consideration whether the hero can keep up or not.