> There are a reason to use Interclient and not the type 4 driver ?
> Should I use what option on a production enviroment *now* ?

According to some my tests InterClient is faster than type 4 driver
(usually not more than 10%, but sometimes up to 100%).

When you are using JDBC driver in non-managed scenario, you can
choose either InterClient, or type 4 driver. When you want it to be
integrated with J2EE server, type 4 driver provides you JCA
interfaces, InterClient - not, and I would choose type 4 driver in
this case.

And I agree with David, that I'm not willing to develop InterClient
too. We might consider creating type 2 driver as an option to reuse
gds32.dll or gds32.so for communication (but that's just an idea).

Best regards,
Roman Rokytskyy