Well...
DBP has more commands that DBC.
DBP has support for more advanced features.
DBP is still being developed and enhanced.
DBP is compiled and not intepreted, so it is faster.
DBP has support for the high performance DBO format.
DBP has excellent plugin support and a whole slew of extra functionality is available including collision libraries, physics packages, advanced string manipulation, ZIP support, etc.
You're also more likely to get better help and bug fixes from the forum users as well as direct support from TGC.
Does that help?
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TAZ