MX25 launched around 2006, came before MX200 launched 2008. The Mx200's are more of a progressive set, big cavities on the 4/5/6/7 less so on the 8/9/PW. The MX200's also have y tune technology, so misses off the toe are less impactful.
If you wanted to try some MX200's at a reasonable price, I notice there are a set 5-PW for sale on this forum 
