I've cooked on an Akorn and a Grilla Grills Kong Kamado, as well as multiple offsets (direct and RF), a Rec Tec Pellet Grill, and now a Spicewine Insulated Cabinet. I never really enjoyed the food off the kamado, but that was a long time ago and I've gotten quite a bit better. My RF Offset (Johnson Smokers) was my favorite cooker with the best flavor...until I got my Spicewine. I figured I'd be going "backwards" in terms of smoke flavor going from an offset to a cabinet smoker, but I've been very pleasantly surprised by the insulated cabinet smoker. I bought it used and it had some good seasoning all around, and so far I'm loving the food coming off of it. The smoke flavor is surprisingly good and I'm using B&B Hickory Lump, and I'm chopping my wood splits down to chunks / kindling and using that for smoke flavor.
I was always curious how the food would taste from a cabinet cooker, in a very similar manner to the question which you've asked in this thread. All I can say is that I'm very happy with the flavor, I love the convenience of this cooker compared to the offset, and both me and my customers are loving the food coming off of it.
On a final note by swapping to the cabinet I've effectively more than doubled my capacity compared to my large "hog style" offset smoker. I have 4 racks and each rack is easily capable of doing 9 butts. My offset I was maxed out at about 24 racks of ribs, and that was using a $150 rib rack...now I can easily do 32 racks laid out normally (8 on each rack).
Finally, about flavor of kamado vs cabinet I feel like the cabinet has a better, cleaner flavor because there is more airflow. My kamado's had almost no draft at all and the food always kind of had that "stale" smoke flavor. My cabinet has a great draft and I do use a fan system to keep the temps right where I want them (Cyber Q wi-fi controller). Good luck with your choice, but personally I feel like the ISV's are a no brainer.