Kiriki

There's no need to dwell long on Kiriki as it's just a KDE clone of Tali (review here), which is in turn a Yahtzee clone. There's almost no difference - I think even the default names for the computer players were the same. All of the same features are used the same way to the same result: a decent game of Yahtzee.

The only real difference that's readily apparent is the way the dice look. Tali featured nice looking rounded red dice. Kiriki features nice looking sharpish-cornered red dice. For what it's worth, I like the rounded ones slightly better, but that's totally a personal-taste thing, and has absolutely no effect on the gameplay whatsoever.

If you're using Kubuntu, I assume this is one of the games installed by default. If you're using Ubuntu (i.e. Gnome), then Tali was installed by default. Just go with whichever one's the default for your system as there's no discernible difference at all, outside of the tiny little corners of the dice.