Leveling a new 80: best suited for PvP?
I think the only thing to consider while levelling is to make sure you either take the time to unlock all the traits, or check popular builds to see which ones are most likely to be useful and unlock them.
Because you can unlock all the skills and traits in this game and swap between them freely you don’t need to worry too much about your final build while levelling. It’s more a matter of simply getting to level 80 and then (if you don’t already know) working out what build you want.
“Life’s a journey, not a destination.”
Level through sPvP if PvP and WvW is your main aim. sPvP gives you plenty of Tomes of Knowledge (1 level / each) through any reward track, this way you can do what you enjoy straight away (minus the tutorial instance) It’s not the fastest way, but for someone who enjoys sPvP it will be the most enjoyable way. I got ~310 ToKs left over from Wolf to Dragon and I used quite a few of them aswell.
If you plan on PvE’ing on the side aswell I recommend to at the very least unlock some Waypoints along the way.