In Oblivion Shadowrend outstripped Umbra, in both physical damage and weapon enchantment. Also, Umbra's lack of any type of magic damage meant that by high levels, it was pretty much worthless except as a means to recharge the good magic weapons you enchanted with Sigil Stone magic.
http://www.uesp.net/wiki/Shivering:Shadowrend, they are at best equal to umbra's. depending if the wiki means its top damage is before or after using master repair skill. i can see why i forgot about it though, i hate two handed weapons. so i would have never used shadowrend and thrown it out as soon as i got it.
Edit: daedric claymores in morrowind did 1-80 damage in chop i believe, and with enchantments i was always able to make them superior to every thing else that game had.