Some Defi Coins play very well on crypto market. Is it good time to invest in Polkadot Coin?
DOT brings interoperability which is very important. Also building chains with substrate is easy... there's a few vids of Gavin giving a talk and ripping out a blockchain in 20 minutes. The bet against "one coin to rul them all" and developer friendliness is enough to ensure a bright future. The tokenomics revolving around parachain loans are good as well.
Polkadot and Cardano are safe bets for the future. They are better then competition and if you compare to etherium the have a advantage since they come later to crypto space and don't have same problems ETH has. ETH is still king but for future we may see a change in that.