They're both priced the same around here.
But I cant find any solid information on the net, or proper comparisons.
12M is older and 14H is newer, thats what I know.
12M
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&cs=04&sku=320-2676
14H
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&cs=04&l=en&sku=860-BBCG
But I cant find any solid information on the net, or proper comparisons.
12M is older and 14H is newer, thats what I know.
12M
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&cs=04&sku=320-2676
14H
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&cs=04&l=en&sku=860-BBCG