Thac0
Icewind Dale, (9 to 11): Gender, Race, Alignment, Class, Stats, Sound set, Portrait, Name, Weapon Proficiency, +1 choice if multi-class or dual class, +1 choice if your character has Thief skills
Solasta (15): Gender, Race, Subrace, Background, Personality Flags, Alignment, Languages, Class, Archetype, Background, Skills, Sound set, Name, Ability Score or Feat x2
Whether you're talking combination or permutation, Solasta wins for character building. Also, since two of those choices can be a feat--which are a big deal in 5E, the choices are even more significant.