I did not try Isabella, but her roommate Coco was above average for HK micro. What I like about Coco, besides the obvious, was the fat that she wore glasses. She was quite flattered when I asked her to put the glasses back on for ACG.
Isabella is not bad looking, and both are fairly tall for Chinese.
Based on looks and attitude (only met Isabella) I would recommend Coco. But you might do very well with Isabella