This IBM paper and the next HP one are really brilliantly written ...i would suggest you to read both the documents (at least the initial bit of both) at the websites mentioned below. The last article goes on to say that Token Ring Networks are better.
"Manufacturers of token-ring equipment have been challenged with a declining population of purchasers, which in turn lowers the volume of products that must be built ...As the suppliers' attention has been on other opportunities, this has caused an even steeper decline in the availability of parts and materials from which token-ring products are made. These twin trends have conspired to turn a gently shrinking market downtrend into an accelerated decline.....Oddly, only one of the above ROI (Return Of Investment) elements has any place in a token-ring to Ethernet migration. The return and benefits are all clustered around the area of application enablement. Of all the cost cases and business justifications of migration that we have reviewed, the businesses that migrated found that they had positioned themselves for unfettered network growth in the future, but had not saved any significant near-term money."
--- IBM Red paper (Token-Ring to Ethernet Migration)
"Token-Ring was one of the earliest ring topologies used for networking and was once, the most popular ring access technique in the United States. However, as Ethernet started to gain momentum in the late 90's, Token-Ring NIC sales have been plummeting for many years now (please refer to the following figure for the world-wide sales trend of Token-Ring NIC). The key suppliers of Token-Ring NIC have either discontinued their Token-Ring products or announced their discontinuance plan. Over the next 1 to 2 years, the shortage of Token-Ring NICs supply may drive up its pricing and would cause difficulty for continued support of Token-Ring products. As a result, organizations that put off their plans to migrate to Ethernet-based solutions may run into the risks of increasing the cost of ownership due to shrinking availability of products and vendors. On the other hand, Ethernet has gathered complete market dominance in the LAN market as Ethernet moved from 10Mb/s to 100Mb/s, and now to 1Gigabit and 10Gigabit. The market dominance of Ethernet has brought down the cost of acquiring Ethernet equipment and the cost of network management."
--- Hewlett Packard (HP) (Token Ring-to-Ethernet Migration)
"In recent years prices have dropped on Ethernet adapters, hubs, and switches. At the same time Ethernet speeds have increased from 10 Mbps to 100 Mbps to 1 Gbps. These developments, despite the numerous performance and technical advantages of Token-Ring technology, have led some Token-Ring Network Managers to begin looking at Ethernet..."