Easy access, cooler weather (compared to most parts of SE Asia), various options on decent places to stay (compared to Cameron Highlands where I have yet to discover an acceptable hotel), real culture (unlike Cameron Highlands where they try so hard to be 'English' & fail miserably, just hate that mock tudor architecture), authentic local food & most importantly you do actually get service over there (compared to most of Malaysia where its almost non-existent).

I agree Cameron Highlands is more picturesque, and Bandung is not a particularly attractive city in the urbanised areas. But if you look further beyond the city centre, the areas surrounding Bandung can be quite pleasant.

From a tourist point of view, yes Cameron Highlands is probably a better choice if you can bear with the hassle of getting there & all the negatives I have mentioned above. But as a 'traveller', I wouldnt write off Bandung ....