In my opinion, almost all top blockchains are more promising than bitcoin. It is outdated, it has a lot of technical problems, and new altcoins can avoid these errors.
And what can you say about the Lightning network? As far as I know, it is already working successfully, but not in the mass version, the work is being done in test mode, so to speak, so when it starts full-scale integration, many altcoins will be useless.