Both, depending on the use case. Unfortunately Claude is better in almost every regard than ChatGPT but fo coding so far. So you would not notice improvements if you test it only for code. Where it shines is understanding complex things and ideas in long text, and the context window is AFAIK 2x than ChatGPT.
Tried it for other things too, but then they just seem the same (to me). Maybe I'll give it another try, if it has improved since last time (2-3 months maybe?). Thanks!