Let's assess the skills each job has:
Scientists have some skills that compliment their previous job class, namely Sharp Sense, and Berserk. Gun Overdrive basically augments the standard gunshot, and not skills (I'm not sure about this)
I'm a level 178 AC Cyber Hunter, and for the most part, it's more geared towards PvP in my opinion. You basically have access to Aura of Luck (another Luck boost) and Sticky Icky, which debuffs Luck, DP, and HV. I'm not sure if this stacks with Shield Breaker, but if it does, you can basically make any enemy into a defenseless whimp. Another skill Cyber Hunters have is Landmine, but it doesn't do too much damage, since it's dependent on both Luck and DA, which may be lacking for both in an AC build
All in all, I say that Cyber Hunters are slightly geared towards PvP and boss hunting due to their access to two useful debuffs, while Scientists are geared more towards PvM with their AoE and critical damage booster.