I would go with the "level to 30" for both classes. I played a Rogue long ago and I loved being able to tear through enemies and barely take damage at later levels due to dodge and the like. Based on my own experiences, Rogues are VERY gear dependent (you need to keep getting nicer weapons anyways), whilst I am finding out that Druids only need to use their weapons for stats, and aren't concerned so much with their weapon damage (boomkin?)
When I played pvp on my Rogue, it was great being able to stun lock opponents, and sap their healers, and sneak around at my pleasure. With my Druid I am working on, I am finding its a little more difficult to sneak, kill, and resneak, especially when it comes to killing in capitals :D
Rogue can cut through enemies fast, but will eventually need to heal after fights (and healing during close encounters may be difficult, and vanishing requires materials), while Druids seem like they can rip through enemies (possibly a little slower), but then can heal themselves with their mana real fast as they are looking for the next target, and then shape shift back into their cat form.
Check them both out, but I most certainly like the Druid and what I read based on its versatility, especially should I change my mind and want to do raiding, etc.
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-Reifelstein
Zuluhead 70 Shaman Horde
Bleeding Hollow 56 Shaman Horde (Guild AGRO baby!)