Osram SON lamps tend to be more pink/peach colour. Philips lamps are the more yellow/golden white colour.
Even old Philips lamps run the more yellow colour, I have one which ran for 14 years, its now dim but not pink. My childhood memory of SON lighting (circa. 30 to 35 years ago) was that the lamps were distinctively pink, and by comparison the current "gold" colour of SON is rather bland by comparison - it just looks like SOX heated up! If I could replace all my Philips SON lamps with Osram ones in one fell swoop, I probably would!
There is currently an excellent example of pink-burning SON lamps on the A12 Brentwood Bypass in Essex. The lanterns are WRTL Arcs mounted at 12m on stub brackets.
This photograph from November 2013 was taken from the Weald Road overbridge in Brentwood.
Although I also believe it's different manufacturing processes that causes the different colour hues, this photograph does support the theory that pink-burning SON lamps aren't as bright and efficient as their golden-coloured counterparts. There is quite a drop-off in light underneath a pair of pink-burning SON lamps further along the carriageway. If this is a result of different manufacturing processes, it probably explains why pink-burning SON lamps are much harder to find these days - even on the Brentwood Bypass which used to have many more!
Another view of the A12 Brentwood Bypass in Essex from November 2013, showing a patchwork quilt of pink and gold.
It would be excellent if SON went back to being pink again, but I can't see that happening!