Flying Blue (Air France, KLM, and Other Partners) - DL or AF for mixed segments

Hi all,

I have to travel to US in April

Planned trip is

CDG to LAS
LAS to SFO
SFO to IAD
IAD to CDG

My questions should I book all with Delta or with Air France
I'm FBG and I was thinking that chances to get a free uppgrade on domestic DL flights are bigger if I buy at DL (you can ask for it when booking)

Prices are the same

Thanks

SQ (Singapore Airlines) - why does that appear in the title?

If it all costs the same, and if you think that booking with DL will enhance your chances of domestic upgrades, then go for them...just check the fare classes on all DL legs and see how much they earn in Flying Blue, as compared to the same flights when booked as AF, as there is a good chance you will earn far less miles when you book the flights as DL flights.

Thanks, SQ typo error meant segment
The main reason I was thinking about it is that when you are DL you can ask for an upgrade thing you can't on AF tickets flying DL

Chances for an FBG to get an upgrade seem (very) low?