Neither one is better. OBD has nothing to do with performance. It means On Board Diagnostics. In both cases, they are specifications required by the US Department of Transportation for all cars to be equipped with.

The main differences between OBD1 and OBD2 are as follows:

- OBD1 Honda ECUs are pretty simple to chip; the construction of OBD2 HONDA (not necessarily other companies') ECUs makes them tough to chip
- OBD2 includes a diagnostic port which can be hooked up to a reader
- OBD2 includes a "learning" capability which will negate any changes in ignition timing you make by spinning the distributor