Only played a few Ragna's in my short time of playing Valk, so I'm not much help but I would agree that Ragna has the advantage in this case. Ragna's pokes are just generally faster then Valk's (Don't ever think your 5B will beat his 5B). Though they have the same health, Ragna's healing ability has never been such a bitch to deal with.
That said, Ragna is still a predictable character, where as Valk has some really stupidly easy mix-ups into big damage. At this point in time, people are still unaware that 236C is an overhead. Make use of that.