Ethernet and wireless networks each have advantages and disadvantages; depending on your needs, one may serve you better than the other. Wired networks provide users with plenty of security and the ability to move lots of data very quickly. Wired networks are typically faster than wireless networks, and they can be very affordable. However, the cost of Ethernet cable can add up -- the more computers on your network and the farther apart they are, the more expensive your network will be. In addition, unless you're building a new house and installing Ethernet cable in the walls, you'll be able to see the cables running from place to place around your home, and wires can greatly limit your mobility. A laptop owner, for example, won't be able to move around easily if his computer is tethered to the wall.
Do wired networks have faster transmission speeds than wireless networks?
Wired networks are typically faster than wireless networks. Taking factors into consideration such as reception and interference, wired networks are almost always faster than wireless networks. It should be noted that in almost all situations, either will be fast enough for your needs: when dealing with the internet, it is your connection to the world (DSL, Cable, Dialup) that provides the chokepoint. A faster local network will not speed up the time that it takes to load web pages or download files from the internet.
If you are trying to decide which network is right for you, each offers benefits. Wired networks supply speed and reliability and avoid many headaches of wireless networks: connection requires that you be able to physically attach to the network, preventing neighbors from stealing your internet and eliminating the passwords necessary for wireless networks. Wireless networks provide convenience, typically to owners of laptop computers, but especially to people who will have guests/friends over who will be bringing a laptop, and eliminate the need for wires running everywhere.