I am not able to thoroughly test every feature in various Office suites against each other, so I post what I have here, and hopefully others will pitch in with their knowledge.
My simple tests indicate that when it comes to preserving document layout in wordprocessing and presentation files from MS Office, Softmaker FreeOffice performs better than OpenOffice-related suites. I have not done any tests towards spreadsheet compatibility.
I have only tested the "lightweight" FreeOffice version, not the full-featured commercial one. Some drawbacks I found (as compared to OpenOffice):
- The suite install is available in a fairly limited selection of languages.
- ODF is only supported for wordprocessor documents
- All applications default to using their own (proprietary, by the looks of it) storage format.
- The free suite is a limited version of their commercial office suite
- Licensing is somewhat restrictive. You can install on several computers from one product key, but they all need the same combination of email address and name.
- You must give them your email address (product key is sent by email).