capabilities

Many of the more expenssive micro computers system have special capabilites :These include high resolution color graphics the ability to communicate with wide variety of mainframe computer systemshigh speed arithmetic processing or the ability to handle analog signals clearly,you do not want to payt for these option unless you are going to use them ;but you must pay for these options if you need them.
Decide what you want a micro computer to do for you,then buy a product that has been designed to meet your needs,Micro computers are now so inexpensive that it no longer makes sense to buy the wrong system In anticipation of it becoming the right system some time in the future.