If you get one of their new aircrafts then it is definitely the best option to go for.
- More legroom for sure.
- Service is pretty similar if not better than others (for an economy ticket).
- You'd save on transit time; and flight time (if you choose Emirates or Qatar for example where you'd be taking an additional 2 hours fly time minimum).
- Entertainment system is great and up to date. it has less content that others (Emirates) but still great.
Sadly, no guarantee that you'd be getting their new planes. Especially that I don't think Kuwait airways operates their A330s on that route.