I switched from Copilot to Codeium after only a couple of months of Copilot use - just based on the cost since currently I'm just a hobby coder.

The main difference I've noticed is that Codeium doesn't seem as smart about the local context as Copilot. Copilot would look at how I'm handling promises in a project, and stick to that, whereas Codeium would choose a strategy seemingly at random.

A second, and maybe more telling example, is that I do my accounts using 'plain text accounting' in VS Code. This is a very niche approach to accounting software and I imagine is hardly in the training sets at all - there certainly would not be a lot of public domain text accounts in the particular format (BeanCount) I use in public code repositories. Codeium doesn't make any suggestions for entries as I'm entering transactions, whereas Copilot would see that the account names I'm using are present in another file in the project and suggest them, and very quickly figure out the formatting of transactions and suggest them correctly.