RE: favorite brand of soft drink
For a cola drink, I prefer Pepsi.
I enjoy rootbeer from A&W, Barqs, IBC, Dog & Suds and Stewarts.
I like ginger ale once in a while.
For cream soda, several brands are fine BUT the hands-down, very best, beyond the shadow of any doubt, positively best is Sprechers, brewed in Wisconsin and difficult to find in Illinois. You become aware that it is special within a second of opening the bottle - it has a bouquet that says "This is some good cream soda." Best served over crushed ice.
Sprechers also make an orange and cream drink that is quite good (similar to Stewart's).
Sprecher's rootbeer is good also but nothing special.
Have a good day.