They're both just Jupyter with cloud backends. They all do basically the same thing with the exception of potential integrations with Google/MSFT specific thing

They're both just Jupyter with cloud backends. They all do basically the same thing with the exception of potential integrations with Google/MSFT specific things. E.g Google lets you load data from drive. So when making the comparison I'd just examine my resource needs / how easy I find each to use and/or resource pricing, then pick one that works. If neither suit my needs I'd just use Jupyter on my own machine(s). If you're on Azure the msft one might have handy integrations that minimize how much you need to think about ops. Similarly with colab / GCP.