I haven’t really had time to make a new Hydroid build since his rework, but I think he’s less effective against Eximus/Overguard than Khora. Khora is able to do most of what Hydroid does, but is able to do it better in my opinion.

Khora’s abilities work together to damage trapped enemies, and Ensnare can be used to increase the damage the enemies that are CC’d. It’s probably best to think of Khora’s Strangle Dome as an AOE ability that scales off of your melee weapon instead of a CC ability.
Khora is also a little more versatile for other missions like Disruption where you want to be able to slow down a priority target.

Hydroid on the other hand, feels like he has too much range (for his tentacle swarm) and traps enemies out of sight, sometimes in adjacent rooms. This tends to lead to missions taking longer because you need to clean up enemies individually between waves if it’s a Defense mission. It starts to feel a little like playing with a max range Limbo/Vauban/Wisp Motes trapping enemies far away from the objective.
*I still need to play around with reducing range to see if there’s a good balance where his 1/3 are usable while not making the tentacle range obnoxiously large.