From the past years those are the advantages and the main reason why bittcoin is on top but today's it change lot from the fast transaction to security issues,
1. Today Slow transaction it will need 6 confirmation
2. High transaction fees this transaction is set by the platform owner.
3. I think security will never change from the past month i did not heard news about this.
$. Being anonymous kind of issues right now because of the kyc.