Round the World Swiss Air Business Class Ticket - which FF program should I credit my flights to?

Hi there
I have purchased a Swiss Air round the world business class ticket which utilizes Thai Airways, Swiss Air and United Airlines (for Sydney-Bangkok-Zurich-London-Miami-LAX-Sydney). I have joined each of these airlines’ FF programs. I would welcome your advice on which one I should register in my booking to achieve the best points/benefits. I am also a member of Velocity.
Many thanks

I’d say Singapore krisflyer as it’s the only program you can transfer to/from velocity

Depends on if you’re chasing status or the points. For status check out

For points I’d go for SQ Krisflyer. Also if you get KF status it’s helpful for domestic VA travel for lounge access, etc.