I tend to use Claude primary for creative writing (at which it's better than GPT4 and even Claude+, in my experience), and for explanations, which are more thorough than GPT4 or ChatGPT (GPT 3.5) without any special prompting.
Claude should be more well known, imo. ChatGPT/GPT4 gets all the hype, but Claude is really good too... sometimes even better.
I thought Anthropic has Claude and Claude Instant. When you say Claude sometimes feels better than Claude+, do you mean that you feel Claude Instant sometimes gives better result than Claude?