Windows search is very good , but it is very slow and is time consuming and it takes a lot of system resources and hence is not good for systems with lower configuration capabilities.
Windows search also requires the indexing process which also slows your system. Further the more the indexing , the faster the search results.
Snow bird is a very good software which is very fast in it's search .
Snowbird is a search software which has no indexing process at all. It is a free ware and takes very little system resources and hence very much for ideal searches. It can be downloaded from www.freewarehome.com.