Mac pro as router, should i use INTERNAL airport or EXPRESS for wireless

hello
i want to set up my macpro as a simple server, sharing internet wirelessly and providing storage for TM backups and media files. i also want to access it remotely via Back To My Mac when on the road. i have an airport express that i bought for my stereo to receive airtunes, but am prepared to use it if i will get a better wireless signal by using it over the macpro's internal airport card.
is the card inside the macpro ultimately the same piece of hardware as in the express, or is the express going to handle the task more effectively?
cheers

Although the wireless properties may be pretty similar, the Mac Pro sharing the Internet connection is not as efficient nor as configurable as a dedicated router like the AirPort Express (AX).
For example, using the Mac Pro in this way you can not forward/map ports from the Internet to devices on your LAN.

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