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Apart from great tools such as command line Repadmin and GUI based Replmon, Dsastat (Windows Support Tool) is a command line utility that allows you to check your DCs replications, it compares and detects differences between directory partitions on domain controllers. The tool retrieves capacity statistics such as megabytes per server, objects per server, and megabytes per object class. Then, the tool compares the attributes of replicated objects. You can use the tool to compare two directory trees across replicas in the same domain or, for a global catalog, across different domains.

Following is an end result from the simple command with -s syntax for server names; i.e

dsastat -s:dc1;dc2

For more information, see this