There is good and bad in every UI. If we create a poll to know which one is better, we will copy the bad things.
I think, the professional and semi professional traders of this forum should create a serius thread to list all the important features an UI needs.
Afterwards, we create a poll at BCT with multi vote on this very same list and we'll know which features are important for traders.
After having the important features we create another poll to have an idea of wich kind of display of these features are the best : Polo, MT4, FXCM, ...
Once it's done, we ask in a thread wich are the best and worst things in the best 2 or 3 best trading plateform winning the poll.
With all that info, there will be more interrogation on what to do, we'll know which display(s) to copy avoiding its flaws and which features to implement.