I haven't used IBM's Watson AI but have found Google's Assistant to be the most powerful and accurate Internet search AI. Definitely miles ahead of Apple's Siri and Amazon's Alexa which is highly inaccurate and relies too much on out-of-date and totally inaccurate data. Google is at the forefront IMO for AI Internet search, fast, accurate and reliable with a large developer community and loads of dev off-shot projects and applications. OpenAI is by far the most advanced and powerful AI I've ever used. It blew my mind! I use it daily, but without direct Internet access it's limited to its periodic deep-learning data updates. That said, its incredible knowledge base and ability to engage in a very natural human like way (which at times is scarily close to something approaching human consciousness) makes OpenAI's ChatGPT a really unique special and powerful AI-assistant tool that has the ability to apply knowledge in meaingful and insightful ways beyond just spitting out data searched from Internet like Google Assistant does other AI's. OpenAI's ChatGPT is fluent in over 100 human spoken languages (plus dozens of computer languages) and there's hardly any task it can't perform whether it be writing elegent source code, books, or helping you problem-solve, research and develop new ideas. If/when OpenAI eventually gets full Internet access and real-time data it will be truly awesome.