I've only used MOM but for what it's worth the diagramming capabilities are much improved with the new visio plugin. Previously you could export your diagrams from OpsMgr to visio, but with the new plugin the visio diagrams reflect live health state. You can also create whatever diagram you want in visio and then tie it to monitored objects living in OpsMgr (for example rack diagrams)
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I've only used MOM but for what it's worth the diagramming capabilities are much improved with the new visio plugin. Previously you could export your diagrams from OpsMgr to visio, but with the new plugin the visio diagrams reflect live health state. You can also create whatever diagram you want in visio and then tie it to monitored objects living in OpsMgr (for example rack diagrams)