I expected only more flexibility, in fact since Toast supports DVD-Video UDF 1.02 and BDMV UDF 2.50 it's only a matter of options to be added to the user interface.
The DVD-ROM (UDF) is actually a hybrid because it's suited to DVD-Video and the standard requires that because many old standalone DVD players don't understand UDF at all.
However, UDF is a really universal format, so it's the best choice for data discs. It's the fastest and it doesn't have silly limitations about file name length, file size and so on.
Nowadays, ISO9660/Joliet for data discs is pointless, who needs Windows 3.1/95 compatibility?
Despite these little issues, I still consider Toast Titanium among the best burning suites.