I previously drove Iswara and just got the Bezza Advance. I've just got the car so I can't comment on long term feelings.

VSC along with TRC isn't really noticeable (the manual says not to drive >90km/h and no hard braking for the first 1000 km so I can't really test it) unless it kicks in and save your life. Interestingly, HSA and regenerative braking is not mentioned in the manual unless I'm missed it, someone please correct me if you find it in the manual thanks. I can say HSA only holds your car for a short while for you to put your foot on the accelerator pedal and it doesn't activate if your gear is in [R] (It functions in D4, I haven't tested 3 and 2 yet).

Overall, I suggest to go for the Advance if you want its safety features and the better interior (the leather seat isn't too bad). After driving for a few days, I feel Eco Idle isn't a major selling point but maybe the fuel savings will prove me wrong after a longer period.

Btw, does your Iswara have a problem in the morning when the engine is cold the engine will stall out even when idle? The warm up time is really slow for my Iswara.