Port forwarding: Base station as bridge or modem/router as bridge?

I use a modem/router (Netopia Cayman 3346) to connect to the internet. It's hooked up to my airport extreme (old round model) to go wireless.
I now would like to forward some ports. I understand you have to set either the airport station or the modem/router as a bridge and then forward the ports on the other device. Am I right so far?
My question: What is the difference (if any) to bridge either one of the devices? Any pros or cons in using Airport as port forwarding device or my netopia? Which one shall I set to bridge mode? Both allow to set port forwarding.
Thanks for clearing this up for me.
Gordon.

I'd like to forward some specific ports. For example port 36391 (TCP/UDP). I know that to do this I have to set one of the two devices as a bridge, and then configure the other device to forward the ports I want. I also know that I can either set up my base station as the bridge or my modem/router.
My question is: which one of the two shall I choose to use as bridge? Airport base station or modem/router? Does it matter or not which one I choose?
Thanks

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