What is your most valuable resource for researching data and analytics trends and emerging technologies?

Gartner 

I go with google and Gartner. Gartner helps with industry trends, tools available, maturity matrix and capability. with Google, I get fair sense of end user reviews and challenges faced during implement and issues with various tools and technologies. Accordingly, basis my business needs and budgets available, I go with the solutions. 

Depending on how bleeding edge you are focusing.
As mentioned, your usual advisory and trend firms are great for macro level insights or more established technologies.

If you're interested in the more bleeding edge, technical blogs (such as medium) and Twitter (unfortunately) are unrivaled. These are usually from the mouth of the horse, rather than having to go through research, validation, internal review and signoff processes the firms have in place.

TikTok is also heavily underutilized, I've found several high quality publishers on TikTok with extremely insightful content. The casual presentation also leads to a lower latency on delivery even moreso than Twitter

Some of the most valuable resources for researching data and analytics trends and emerging technologies include:

1. Gartner: Gartner is a leading research and advisory firm that provides insights into the latest technology trends, including data analytics and artificial intelligence.

2. Forrester: Forrester is another research and advisory firm that provides valuable insights into data and analytics trends and emerging technologies.

3. Harvard Business Review: The Harvard Business Review features articles, case studies, and research reports that cover a wide range of topics, including data analytics and emerging technologies.

4. McKinsey & Company: McKinsey & Company is a global management consulting firm that provides insights into technology trends and emerging technologies.

5. Technology-specific blogs: There are many technology-specific blogs that cover the latest data and analytics trends, including KDnuggets, Towards Data Science, and Data Science Central.

6. Industry events: Attending industry events, such as conferences and meetups, can provide valuable insights into emerging technologies and industry trends.

7. Social media: Following thought leaders, industry experts, and companies on social media platforms like LinkedIn and Twitter can also provide valuable insights into data and analytics trends and emerging technologies.

I start with Google. There is not one site that has information about everything.