Speed set. The other set could be potency (to increase the chance of applying the health down with his zeta unique) or tenacity to resist TM removals or debuffs if you don't run Traya in your team.
The cooldown increase from his force drain can't be resisted (tenacity up doesn't help), only dodged. If no dodging is involved --> 100% chance to increase CD on debuffed enemies, 50% for non-debuffed ones.