This is an easy question, but only in the sense that it is pretty easy to ask it.

For helping you with an answer, we would need more information.

1. You would have to tell us what you expect statuswise (each Skyteam programme has different perks that come with the status). Or are you just interested in becoming ST E or ST E+?
2. Also you should take into account that having status is typically most beneficial if you primarily fly with the airline with the programme of which you have status.
3. Regarding your RTW trip, it would be helpful to know the routing because it would then be possible to consider the different options of earning miles with different programmes and, based on this information, look at the status level you could attain with these programmes.

Back to you. :-)