[com2kid]

IMHO the largest difference is the amount of time you save hunting down stupid issues. e.g. no more spending 3 hours fixing a typo.

Also, code is much more manageable, and refactoring is tons easier.

With enough Babel plugins, you can get ESNext functionality that does whatever you want (some of those early stage proposals are really cool! They might go away tomorrow, but hey, so cool!), so Typescript's old advantage of offering more language features is kinda nullified.

In the end, I started writing the later part of my current project in Typescript, and I much more enjoy working on that part of the code than the earlier parts.