Both cub and adult Kiara have their points.
Cub Kiara ranks as one of the cutest cubs, and her innocence and adventurous nature make her a fun little cub!
Adult Kiara keeps quite a bit of her old innocence and slightly childish mannerisms, but with a little more wisdom (I actually think that she's a late adolescent at the end of LK2 rather than a full-grown adult). Her old cuteness is replaced by a regal beauty that I reckon even Nala would have trouble matching.
I say Adult Kiara wins...but by the tiniest of margins.











