I sold my Sami (RIP little buddy) and purchased a 4 door kick, and wanted to give my impressions:
Pros:
* A/C
* Power steering
* VASTLY superior suspension. The trails are MUCH smoother, and I'm not thrown around in the cab. The comfort factor is MUCH better.
* More power
* Better (yes, BETTER) gas mileage (24 vs 19MPG)
* WAY more room
* Cargo is more secure from theft
Cons:
* The Sami could go more places (but the Kick is pretty close - just have to watch entry / exit angles more)
* Looks - the Samurai is way better looking than a 4 door kick.
* Aftermarket support for the Samurai is stronger, and there's more lift options (I want to keep IFS)
There's something more 'fun' about driving the sami (especially with the top off), but I'm way happier with the kick. So far, it's taken me down every trail the sami did, and it's a vastly superior daily driver. I drive it 80% on road, and 20% off.