Here's my take as a scanlator myself on all the groups doing this rn. Banchou's S1 was and still has the best quality.
SimpsScans definitely the best. Not only did they do the SFX, but they also released first with better typesetting and font choice than the other groups. Sadly they won't be doing any more chapters as they said it was exhausting for all of them
So if you have spare time and know what you're doing, please contact them. (Send a message to the guy who uploaded the chapter or smth)
Flame-Scans so far has been the worst quality-wise so let's hope they can improve. They released last (114) and didn't even do the screams
They translate the SFX, but let's be real no one like "SFX: BAAAM" written with small font off to the corner. It's distracting and plain annoying. You either do no SFX or you do them all. And it's not even proper SFX lmao, it's the action typed out... "SCREAMMM" being an example, you just don't do this. You have "SKREEEE" or something similar. Usually never a verb with added words on the last word.
As for Bored College Students, their quality is really mediocre but I am seeing them improve which is nice. Same criticism to them regarding the "SFX: BAAM" stuff I wrote for Flame-Scans but hey, at least they didn't use verbs....
I'll end it with saying that this is not personal to any of the staff working on it (I don't even know them), and is nothing but just throwing out
some words mainly cuz I'm bored.
But this is personal; Fuck you to everyone calling other groups a sniper or something similar imo they're not. Yes, it can get annoying if you get 4 notifications but just fucking ignore it if you've already read it and no one gives a fuck about your notifications anyway.
Enjoy Solo Leveling from whichever scan group you want, in the end, it's your choice.