We are in planning of upgrade from lower version to higher version and looking for best and stable version with out any issues.
Also could you please guide us best planning approach to implement this activity.
If you are on cloud just ask OneStream to upgrade to the latest, or the prior version. Onestream is stable version. The latest versions have features that can help you improve the current model.
If OneStream server is managed in-house, ping me to check the environment and decide the best course of action.
The best version is typically the latest one. If your environment is in the Onestream Cloud, just talk to Support and everything will be taken care of. If you're on-premises, you might still want to have a chat about possible gotchas of a specific release, although the procedure is typically very straightforward.