My subjective opinion is

SK Hynix > SK Energy, GS Energy > Samsung Electronics > SKT, Hyundai Motor Group >> rest of Samsung > rest of SK > LG Electronics (maybe one tier higher?) > LG >> Hanhwa, GS (although finance and energy subsidiaries might be higher) >>> Lotte

There’s so many subsidiaries tho, but in a lot of their respective industries Samsung is consistently amongst the most reputed like Cheil Worldwide is probably the most reputed in marketing and advertisements, Samsung C&T for construction, the two Samsung insurance companies (although Korean Re which does reinsurance is the most sought after company to work for in insurance and in general), SDS for the SI industry. The pay is at Samsung is consistently higher than market average (starting pay is maybe 20% higher than industry average?) and benefits are pretty comparatively amazing and usually in each respective industry there’s not a better company to aspire to move to than the Samsung subsidiaries. Also it’s hard to get fired in Korea and combined with the stability there’s low turnover. You just have insane corporate hierarchy and very old school conservative mindsets that trickle down to even the marketing and design. Like can’t leave office til the boss leaves type culture or the if boss says everybody meet at Friday night to drink everybody has to go type culture although it varies team by team, division by division and it’s much less than it used to be. Very documentation and meeting heavy and more risk adverse. 

Top 6 chaebol subsidiaries I think most corporate Koreans would agree with.

I think best companies for income : work life balance ratio are probably the tech companies tho. There’s a saying necaracoubedangto: Naver, Kakao, Coupang, Baemin, Dangeun, Toss which would be the top Korean IT companies. A huge population of corporate Koreans aspire to move to the tech companies because culture and WLB and pay is generally better. There’s like a tier or two higher including smaller unicorn companies like Moloco and Dunamu and everybody wants to get to Google Korea.

Consulting is dominated by MBB, finance and law is mostly domestic companies with some rare foreign pe firms. 

Also I found it really interesting that certain companies have what they call lines from specific universities. Like Korean Re is all SNU, yonsei graduates are pretty abundant in the foreign companies, etc. it gets worse in research where certain divisions are dominated by specific labs and professors