Even when there is no problem with Bitcoin's or Ethereum's network (without network's congestions, I meant), I tend to use Dogecoin for my cross-exchange movements.
I have never experienced network congestion with Dogecoin.
I am not sure that over its long history, Dogecoin has experienced congestions or not.
Someone who have more time in the crypto, can confirm that.
I used Dogecoin for transfers between exchanges when the network Etherium was a big the cost of gas and problems with the network because Cryptokitties. In this regard, the Dogecoin is very profitable.
2 to 4 times per year. However, it seems right for most of altcoins, not only Dogecoin. LOL.
But as an asset Dogecoin interesting - one or two times a year it pump up.