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it is totally different applications devices nexus mainly used for Data center and visualization cloud networks, and ASR mainly used for Service provider networking proposes.
for more details please see the following links, and you are welcome any time.
http://www.cisco.com/c/en/us/products/switches/data-center-switches/index.html#~technologies
http://www.cisco.com/c/en/us/products/routers/asr--series-aggregation-services-routers/index.html
http://www.cisco.com/c/en/us/products/routers/asr--series-aggregation-services-routers/index.html