I'd go with Rogue / Warlock simply because rogue really doesn't need all the debuffs warlock supplies, but the interruptions (stun / sleep) is basically all it really needs...however, the debuffs are an added bonus....I have a rogue / lock (I'm a lil' bias cuz I just love warlock) and I'd never really had to rely on the trap + sleep bug or have to use DD (only use it w/ the kd + wounds combo)...normally only use the bug against people that run away too much.
Against people with holyspell, yea...you'll have somewhat of a problem, though hp / vigor grains can cut down it a lil' bit....disease, stun, panic, bleed still go through (death trap too, as I'm told)....get panic and bleed on then go to kd > dd > scud > mortal wounds, if they didn't die then, the next hit as they're getting up has a chance to finish them off.
Warrior / Rogue ...really needs the grains to live through PvP. Dull / Bleed increases the damage to a few moves...and they have the skins and vital, as well as 1hs. Work down the hp with DA 'n 2hs...go to kd > dd > scud > mortal wounds...next hit'll probably kill 'em, as well.
Though, if they were to go head-to-head, I'd give props to the rogue / lock (that knows what the hell they're doing) against a warrior / rogue...
lock against anyone that's not with a cleric sub already has a nice advantage...and those that use the pill bug (pre-lv10 statuses) really don't have much help from that, especially once they get the AoE stun / sleep alongside the small cooldowns of the debuffs / interruptions.
Eh, they both do good at PvP...all that's really needed is a know-how on the build's usage (including the pros and cons) and a decent set (gear). Just go with what you'd like more.
Rogue / Lock vid:
http://www.youtube.com/watch?v=dAf_0BNhR60Warrior / Rogue vid:
http://www.youtube.com/watch?v=BHC4sUW8Ij4UnbeatableDevil wrote:
I'd get a rogue/lock, a guildmate of mine had one and it totally dominates, unless you are versing someone w/ holyspell, then you are outta luck

. Warrior/lock is a good build too ;]
You're still a nab, TJ ;P