whenever you are looking for an altcoin to use in order to transfer money between exchanges, the withdrawal fee is not the only cost that you are paying!
the first cost which can be quite big depending on your amount is the trading fee. for example if you want to transfer 1BTC with an altcoin you have to pay 0.002BTC (which is the same as withdrawal fee in most exchanges even bigger in some) to buy that altcoin and then pay the same fee to sell it in other place. so you paid twice or thrice the withdrawal fee to transfer using an altcoin here!
another thing that most people miss is the price difference!
for example using Doge, you buy it at 30 satoshi and sell it at 29 satoshi. that is 3.33% loss.
if price is lower like 20-19 then it is 5% loss and so on.
I second to this.
Beside of exchange value from both coin, you need to consider bid/ask rate, trading fee and transfer fee.
If you miscalculate, you can ended up paying bigger exchange fee.