depends on what you want
lancer seem to be a class that is only going to be strong at future ranks 9-10, (initiate scaling is very strong)
dragoon already got its power spike with dethrone, its hard to tell because who knows what skills will be implemented at rank 9-10?
there is a chance that lancer is either super op or trash, i took that gamble and picked lancer, ( i do have a pve hoplite dragoon c2 though)
currently both are great at pvp and don’t let anybody tell you otherwise.
Dragoon has the upper hand in terms of damage (serpentine and dethrone)
Lancer has the upper hand in terms of utility (initiate’s block penetration and block, joust silence, crush reduces physical defense and physical attack and unmounting skill)
If you are looking for a straight up pvp player i’d pick lancer
if you want your cata to have pve capabilities (which would require a lot of work in terms of attribute lvl and damage)
go dragoon c2, you can also pvp with a dragoon c2 as well dethrone is pretty good against archers and wizards/clerics that don’t have r7x, i played some pvp on my hoplite dragoon 2 for fun and i have to say dethrone is awesome. I enjoy both classes so it really is your choice
i really love my lancer though