The only difference? lol
The main differences between the other top 20 cryptos is that Doge was a dead project with no recent developer support (since 2019) until Elon's tweet. It was and still is a joke.
There is no limitation on the supply of doge. With 15 million mined every day and no mining reward halving(as with BTC, LTC, BCH etc), which means a never ending dilution of value, unlike most top cryptos where their scarcity and limited supply adds to their value. Doge by it's fundamentals is not designed to be an asset that appreciates long term in value.
Doge's price is one of the easiest cryptos for whales to manipulate because of the 6 million holders, the top 20 holders own 50%+ of all Doge. One person owns more than 28% of all circulating coins.
It doesn't solve any problem or provide any utility that other more secure cryptos provide.
But congrats to the lucky noobs and the few strategic players who made a lot of money off it.