best in doing what? you should first clarify what you mean.

a best long term investment? yes absolutely.

a best short term investment? not the best because altcoins get pumped and in short term they give much more profit but they get dumped right after so they are terrible as long term investment.

a best in developing? yes, since it has the best developers team that have been working on the code and reviewing each change and testing it to death to protect bitcoin as it is.

a best in sense of security? yes it is using cryptography algo that are strong as much as possible and as much as needed.

a best in distribution of the supply and having a good inflation rate and over all a good economical outlook? you bet your ass it does

a best in decentralization? yes. the way it works is the best decentralization compared to others.

a best in network security? yes it is because it has the most number of nodes, spread all over the world and the number of them is high enough to protect the network as the bankbone of bitcoin.