Any suggestions on the best fluid for an 06 outback auto?

Subaru don't sell normal "Subaru ATF-HP" here they sell Castrol..

If iI choose between,Fuchs titan 4400, or Millermatic atf or Subaru ATF-HP fluid, anyone of those stands out better than the other?

Regards

Is it for the box or power steering ?

Any of the three mentioned above will do th job as long as it meets the oem spec,

Millers or fuchs then castor is what I'd go with, have you looked at opie oils site ? We get discount too

It's for the automatic transmission, so Fuchs and Miller are better than oem then?

Millers has a really good reputation it's British made as well, they make loaf's of oil for different aplications no idea what the oem oil manufacture is, but you my even find it in your local motor factors, I did and it was about 8 quid cheaper than anywhere else