Do you like chocolate or vanilla better? Though I would say if you are using these website versions you will only be getting half the magic (at best) of what llm services can offer.
I always thought the choice was between, do you want the company that is honest about being dishonest, or the one that is dishonest about it.
I'll buy that as a possible separator as well. For what it is worth, I prefer to code with "Claude Code". I use chatGPT (the web interface) when asking casual non-coding questions.
up until GPT 5.6 sol the answer was Claude. Since then GPT5.6 Sol and GPT6-Astra are better than Sonnet/Opus/Fable.
IMO as someone using and building with these every day.