I can't tell if you're joking or not.
Since the OP doesn't understand that 802.11g wireless is the equivalent to a dialup modem in terms of speed, I would have to assume that they are not familiar with computer hardware and are indeed serious.
A wired connection is significantly faster than a wireless connection.
The slowest wireless is 802.11b. 802.11g is faster, 802.11n is the current fastest wireless.
A wired connection is faster. "Fast Ethernet" is a 10/100 connection, but newer systems and network cards run at 1000 (GigE). A GigE network card will cost you about $20 if you don't already have one, assuming your 'computer' is a desktop and not a laptop or netbook.