An open tab, a bookmark, and a saved tab group all retain access to a page, but they preserve different kinds of context. The right choice depends on when you will return and whether the page is an action, a reference, or one member of a reusable set.
Keep an open tab for the current session
Leave a page open when you are using it now or the page contains temporary state you have not safely saved. An open tab is visible and fast to resume, but it competes for attention and can disappear when the window or session is closed. It should not be the only record of an obligation.
Use a bookmark for a durable address you may need later. Put it in a named folder and give it a title you will recognize without the surrounding tabs. A bookmark preserves the link; it does not preserve the exact scroll position, form state, login state, or the reason you saved it.
Save a group when the set matters
Use a saved tab group when several pages form a recurring bundle, such as a weekly reporting set. Chrome documents that a closed saved group can remain available from the bookmarks bar or Tab groups menu, and synced groups depend on the signed-in account and sync settings. Safari tab groups belong to a Safari profile and are not shared between profiles.
Record the action separately
If a page means “submit this form Friday,” create that task and attach or mention the link. Then decide whether the page still needs to stay open. This separates the durable commitment from a fragile browser state and makes cleanup safe.