How to choose
Start with where your work lives. If your team runs its docs, wikis, and project tracking in one workspace, an embedded assistant that drafts and answers questions in context will save more time than a separate tab. If you are standardized on Google apps, an assistant that works inside Docs, Gmail, and Sheets keeps help where the work happens. If you move across many kinds of tasks and tools, a general-purpose assistant you can point at anything is the safer default.
Match the tool to the task. For long documents, contract review, research synthesis, or coding, prioritize a large context window and careful reasoning. For everyday drafting, summarizing, and quick research, a capable free tier may cover most of what you need.
Check the pricing model and its honest limits. All three start around $20, but the packaging differs: some bill per user, and some fold AI into a higher plan tier rather than selling it separately. Read the free-tier caps and each tool's stated weaknesses, since the embedded assistants are only valuable if you already use their host platform, and any AI output still needs human review for accuracy.