I have the Koda 16, gas for me is the only way with these small ovens plus how much Smokey flavour can you impart in 90 seconds?
I would also go for as large an oven as possible after using my brothers Koda 12. It gives you the opportunity to turn in the oven and also not get it too close to the flame.
I have used mine every week for the last 18 months, looking at Gozney Dome when I start building my outdoor kitchen.
Ross