Other proofs than Proof of Work are worse than PoW.

People can innovate more proofs in future and try to advertise their new proofs are better than Proof of Work but they will fail like how many times altcoin developers have failed so far.

About Proof of Work, many altcoins use this algorithm too but there is an unique Bitcoin with its Proof of Work. Other PoW altcoins are not good enough, secure enough to compare with Bitcoin.

https://howmanyconfs.com/
https://github.com/lukechilds/howmanyconfs.com/blob/master/README.md