I have eur at Kraken, one of the reasons I chose Kraken so I can deposit and withdraw eur. Haven't got any usd(t) and also didn't move anything from kraken to bittrex. only from poloniex and hitbtc to bittrex. Two exchanges is enough I figured and Bittrex has a lot of coins.

I do use coinigy to trade because of the very good interface and it's the same for any exchange. Connection with the Kraken API is not 100%. Seems to be a problem at the Kraken side because I did some scripting against their API and their I get several timeouts per day. Haven't lost any coins, but sometimes tried to cancel a buy or sell and that timed out. That could cost you a trade..

Coinigy to Bittrex is very stable and fast. Another reason to conclude that it is the Kraken API that has issues. I am on a paid subscription for Coinigy.

Do remember though that Coinigy is always a little behind the real data. So you might want to have your exchange logged in as well if it were only to get near realtime updates. But I prefer to use the Coinigy UI.