DMT is very well suited for Internet support. The ANSI standard explicitly addressed data access. CAP invented rate adaption. DMT has always been rate adaptive, takes it for granted, and implements it in a highly flexible and elegant way. By contrast, DMT steadily adapts in 32 kbps steps to support optimum rates on all loops.
Performance is equivalent.
DMT is heavily patented or inaccessible. DMT is defined in an open, international standard mandating fair access. Many different manufacturers are independently developing their own solutions, providing multiple sources for DMT components. It is the CAP technology that has remained proprietary and with only one supplier. Solutions designed to the ANSI standard are available now from several suppliers.