Even im new on trading i would still prefer bittrex because its reputable and been operating for longer days already and i didnt even heard about livecoins it maybe famous for someone but not for me. I will just stick to old ways since there are lots of exchanges out there and we i should bother to put up money on an exchange that i didnt heard of.
and there's also good volume inside bittrex so we can make big deals as well and like what you have said bittrex already established their name as a good reputable trading exchange and there's many investors and traders out there.
i did a lot of trades on bittrex with my vip account..and its was always ok..but i also did trades for 50-100btc on livecoin and all was ok all the time!