I personally like the hochfir the most because of accuracy reasons. I mostly like the KE72 Guardian Operative on Nader because it has double time (reload whilst sprinting) and spares (amount of mags carried increased by one). This makes the hochfir more preferable to me. I use it on Phoenix also, but never on Proxy…
What's the best SMG? (Community opinion)
I didn’t though that poll was about personal preference, so I voted KEK-10. I wish I could change my vote to SMG-9 now. 
see, the smgs are so weird, every now and then one of them stands out as a better option (far as I remember it was crotzni, then bilshlock at some point and then hochfir and right now its kek)
But the reason that it’s kek mainly depends on the mercs using it which are bushwhacker and phoenix, both of which are healthier and have stronger abilities (self revive, aura heal and a freaking turret) the damage and accuracy of the kek nearly equals that of the m4 which is super dumb if you think about it.
I think it needs some balancing overall… but that might be because i despise phoenix and bush and think they’re annoying sh!ts 
I personally like Crotzni, but I just know that Kek-10 is stronger, and this knowledge is bother me. Vote for Crobro because Kek need a nerf.
What someone needs to work out is effective dps - that is the average dps when accounting for missed bullets. You could work it out to an extent using accuracy % but since headshot accuracy is not available / published an effective dps model would still be flawed.
For me personally the crotzni / smg 9 / blishlok are all 2.8 kpm and if the blishlok is ad horrible as people point out it shouldn’t be grouped with them.