tai hwa's has a more traditional taste, so its ingredients/condiments used are simpler and less fancy. some people likes it, some people dont. the problem is the insanely long queues, but you can try to go during off-peak hours. i think i waited around 20-30minutes on a weekday late afternoon.

regarding the various outlets, please note that there are 2 different places, tai hwa and tai wah. you may see their history here Behind The Bib: Tai Wah Pork Noodle