Have access to both. Bing feels like a shackled version of GTP-4 with convenient prompt automation. You can see moments of GTP-4 power, but they are buried beneath the AI ethics and brand safety. If you formulate a prompt carefully, you can see the strong logical coherence come through in Bing, but often it feels like it is just parroting and summarizing search results, which is exactly what it has been told to do.

GPT-4 wrote me some erotic poetry about scent kinks, with excellent rhyme and strong creativity. Compelling role play is an uncommon trait, even for humans!

The foundation model is apparently the same, but the fine-tuning is different. So Bing sometimes ends a conversation completely, which the OpenAI fine-tuning (ChatGPT) never does. Also, Bing currently only gives at most 15 replies per conversation. However, Bing Chat can search the Web and use that info to answer questions/provide sources, which is an advantage over the OpenAI implementation you get in ChatGPT+.

I've been using Bing almost exclusively for the last year, and work 2 years.

Part of it was out of laziness and not wanting to change the Edge default, and the other part was after a bit I figured out how to get good results.

And the thing that finally killed Google for me was when I realized every result I ever got from them for the last like 3 months that I used it was incredibly shitty SEO optimized sites with zero answers, and half a page full of ad results.