How On-Line Services Stack Up America On-line Price: $9.95 per month for 5 hours. Discount for volume users planned. Content: Many users love this service. Best source for on-line newspapers and magazines. Ease of Use: Simple interface, but frequent graphics updates are annoying. Internet: Internet offerings nicely integrated with service but the connection is somewhat slow. CompuServe Price: $9.95 per month for 5 hours. $19.95 for 20 hours. Content: Grandaddy of on-line services is the best source for computer help. Also has some of the best discussion forums. Ease of Use: Get WinCim software, which eases navigation. Internet: Relatively fast, but Internet connection is not smoothly integrated with the rest of the service. Microsoft Network Price: $4.95 per month for 3 hours. $19.95 for 20 hours. Content: This newest on-line service boasts content from robatics to roller coasters. But it's too early to tell how it will evolve. Ease of Use: Relatively easy to use, but somewhat primitive interface. Internet: Internet access is not well integrated with the rest of the service. Prodigy Price: $9.95 per month for 5 hours. $29.95 for 30 hours. Content: This venerable service is not as popular as its larger competitors but has spiffed up its image a bit. Ease of Use: Less straightforward than America Online, but easy once you get the hang of it. Internet: Solid connections that are a little speedier than some of its competitors.