HDR made with phone SW will inevitably be of low quality. I would recommend as an alternative to shoot bracketed photos with Camera FV-5 and then to process the photos on a PC with Photomatix Pro.
This way I was able to take some really good HDR photos (see attachments).
If you insist on having a in-phone HDR processing, the only app giving good mix of options and quality results is Pro HDR Camera.
Not able to post links, so just google the bolds.