Whats the best FF Program in all of sky team in terms of benefits.

You cannot say one of them is best, they all have their pros and cons.
Which is best for you depends on where you live, where you fly, how much, and your criteria

totally agree! It will depends on where you travelled a lot and what is your criteria( FF miles, upgrade, cheap fare, comfortability, etc). I am in China. So the best choice for me is China Southern

I think Aeroflot's program is the only one that has their ST E+ at 50,000 miles per year, which means lounge access for less miles flown per year. However, I believe they require that you fly at least 30,000 miles with them specifically in order to qualify. KE Morning Calm Premium Club takes 500,000 EQMs (ST E+ too), but you attain that status for a very long time, longer than the usual annual expiration. If you are based in the US consider NWA or CO because their reciprocal mileage program allows you to double dip on EAUs (really nice!). And CO allow you to get EAUs on Copa and likewise with NWA and Alaska Air (for AS I think they give you certs and after that you can request at the gate) I really think CO is the best of the domestic airlines, they fly the most places internationally as well have the best domestic service and phenomenal premium cabin service. However, it obviously has a lot to do with location too!

Not true. Flying Blue Gold only requires 40k and OK+ Gold 50k. Or you can do either with 30 segments.

As far as I know E+ is typically acheived at 50,000 miles or the km equivilent on all non-US based Skyteam carriers except KE. - There are a few exceptions to this such as with FB for French residents but still all are in that general range.

Some highlights of best programs by benefit:

Customer Service in general: NW
Online functionality: NW
Promotions, easy miles, full earning all fares: NW
First class & one-way awards avail: FB
Platinum for Life: FB
US Domestic FC upgrades on NW: NW, FB, CO
AMEX benefits by geo (level miles and/or addtl cardholders with status): FB
Lower threshold for E+: FB
Clear intl upgrade process: CO
Not strictly op-up auto upgrades: OK


Bad aspects by program:

High $$ costs of award redemption: FB
Lower miles earning fare classes: FB, CO
Buggy, bad online services: FB
Poor customer service: FB
Miles upgrades only on high fare classes: DL, FB
Uncomfortable Y product: FB(KL), CO

... to be updated ...

I like CO as a place to get EQMs for VS and BR; I don't CO or NW much, but my VS and BR flights are enough to get me NW and CO UGs the few times a year when I do.