Originally Posted by
STS-134
TK will match but I think it's probably easier to maintain *G on A3 or OZ.
It's no secret that OZ is easy for *G if you fly international economy a lot. However, it's not known for generosity with benefits.
There's no PE cabin ("Economy Smartium" is more like E+ that you pay a premium for).
Upgrades aren't really much of a thing. Current DPs are "Diamond Plus/top status gets you an occasional OP-UP on completely full flights" and "lifetime gets you upgrades but maybe only if you buy full fare Y".
Buy-ups aren't particularly cheap ($600 each way Korea-N.A.), are only available for full fare Y, and aren't even necessarily available for that.
The Incheon business class lounge isn't anything great (I literally eat at the Priority Pass lounges and then chill in OZ J).
And OZ is stingy with awarding miles for partner flights, even F.
Don't get me wrong: I am all-in on OZ and will pursue lifetime Diamond Plus, since I am based in Seoul. But join OZ for the *G benefits, and not OZ's.