None of them (AI assistants) are perfect... they all have some drawbacks.
For me Windsurf is the best and most reliable for editing multiple files, no doubt. It just seems to understand the context better. But it needs some refinement and some features.
Cursor is the most thought out and has the best autocomplete. But their composer leaves much to be desired.
Aider has some really cool features, and in my opinion, has the best diff editing functionality.
Cline is free (there is an option) and works quite well.
Continue.dev is free and great for autocomplete through the free codestral FIM API.