I am a marketer and content writer myself, and Claude has become the one LLM that's actually worth paying money for. I find that it's better for long, more complex texts and copy, rather than for short marketingey stuff. It understands context really well, and once you invest some more time into writing an elaborate prompt – the output is usually great. Still needs some tweaking, but saves me loads of time. ChatGPT doesn't even come close.
The biggest advantage over other LLMs, in my opinion, is that the output really does sound human, and (if you do a good enough prompt with some examples) it doesn't use the classic generic phrases like "In today's world" and "Here's the thing".