Lethal weapons are better almost in any situation when comparing them with LTL weapons, the reasoning for this is slightly understandable.
Obviously they have been made slightly harder to play due to the arrest timer. However with the limited amount of people playing it, it explains that the weapon is not the right pick if you want to win.
When facing someone 1 vs 1, you can often outplay your enemy by playing smart. However, in a full-frontal fight with both having the same chances and same cover and all shots hitting, Lethal will always win.
When fighting in missions, you'll often find another enemy being there to help out. This means you have to stun two people and avoid getting shot meanwhile. While stunning the second person, the first person probably has the time to escape already and cannot be stunned again. In order to balance this, it would already require your team mate to also play LTL to help spread the stamina damage.
Here's a small list of the current stock LTL Weapons:
Stabba CCG: Gets outplayed by literally any CQC and midrange weapon. The TTK on lethal weapons is far shorter than the TTS.
-> Could use a small buff 6 or 7 shots to stun instead of 8.
Time to stun: 1.05s | OCA TTK: 0.7s | Joker SR15: 0.75s | Star: 0.75s
Stabba TG-8: Feels slow and inaccurate if you use it while moving.
-> Could use a little extra ammo per magazine.
Time to stun: 1s | FBW: 1s | PDW: 0.84s
Stabba NL9: Gets outplayed by any CQC weapon. Requires you to land 3 perfect shots on the enemy with (close to) zero spread.
Time to stun:1.56s | JG-840: 0.84s | CSG: 0.7s
-> Could use 2 shots to stun (again) or a little spread to make it easier to hit people with it.
Stabba PIG
I haven't had a chance to test it yet since the nerf so I don't have any opinion on this yet.
Stabba PFTG (OPGL-CD)
In my opinion doesn't require any buff. This weapon is super powerful for clearing out areas.