See this profound and scholarly article: http://deoband.org/2010/02/fiqh/miscellaneous/mawlid-deoband-and-hanafi-fiqh/
Generally speaking the difference between Deobandi’s and Barelwi’s is that Deobandi’s don’t do mawlid, as opposed to Barelwi’s. Read here the hukm on mawlid from the viewpoint of Hanafi fiqh and find out that there are 3 types of mawlid. Very interesting and profound article.
I sent this link to a Dutch weblog and they censured me (they didn’t allow my post with the link) since they follow shaykh Tahir ul-Qadri and they recently organized a big mawlid under the name “Mawlid Festival”. It can be questioned if they are Barelwi’s but they most probably don’t agree with the viewpoint in this article. May Allah guide them.