I decided to move all my exchange from polo to bittrex for one simple reason, polo seems to have the worst ( or even innexistant ) support i've seen so far.
I applyed for lvl2 verif on both bittrex and polo at the same date, few hours later bittrex was approved but polo never did and it's now more than 3 weeks. I made a ticket for the issue one week ago and still no answer. After just little google i found numerous other people that had issue with polo and took ages before they have answer.
The move went kinda smooth other than the confirmation lin from polo that all linked to "oops error on confirmation link" but ended up transfering the coins correctly. Another nail in the coffin polo ...
I'm thinking to move from Poloniex to Bittrex too.
There are many reasons but one of them is the "Awaiting Approval".
I made two request at the same time and the poloniex one is still pending, it's been many hours and still waiting.
Bittrex seems more flexible in this case, liqui is a good one too, the withdrawal doesn't take days etc.