Most common:
* Is dit jou gunsteling? (This is the most direct translation and works in most situations.)
More specific options:
* Is dit jou absolute gunsteling? (This emphasizes that it's their absolute favorite.)
* Is dit die een wat jy die meeste hou? (This asks if it's the one they like the most.)
* Is dit jou keuse? (This asks if it's their choice, implying it's their favorite.)
Example:
* Is dit jou gunsteling koek? (Is this your favorite cake?)
* Is dit jou absolute gunsteling kleur? (Is this your absolute favorite color?)
* Is dit die een wat jy die meeste hou van almal? (Is this the one you like the most out of all of them?)
* Is dit jou keuse vir aandete? (Is this your choice for dinner?)