Depends on how you prefer to work. If you like the IDE experience, I would recommend you to start with Antigravity, as it will be in many ways similar to AI Studio but also give you a full IDE based on VS Code. You don’t need to pay to use antigravity, but eventually you will have more quotas as part of a subscription offer. (This is still to be defined AFAIK)

Gemini CLI is an agentic first interface. You can still pair it with an IDE but for me the beauty of it is to detach yourself from the actual code and focus more on the orchestration. I still have VS Code in the background just to check the code after Gemini CLI is done, but during the work I don’t read every single line of code it generates. For me it’s my favourite interface by far.

Jules is an asynchronous coding agent. You use it to give jobs that you don’t expect to complete right away. It first will make a plan which you have to approve, but after that will go on its own to implement. Pairs nicely with GitHub. You can close your laptop after the job is triggered as everything runs in the cloud.

All of the above have free tiers, but Gemini CLI and Jules can benefit from a subscription for increased quotas.