I like bahamut, but I've never used ururun myself so...
Cat Comparison #7: Bahamut vs Ururun

No duh, you get Bahamut first.
Ururun has less damage, but faster attack.
Ururun's stamina is not as good as Bahamut's.
Unlike Ururun, Bahamut does not have 20% knockback chance, but Ururun's range is slightly shorter.
Ururun is 110% the cost of Bahamut.
Bahamut looks, say, "awesome". Ururun looks angry and awesome. (Angry becomes "attractive" at level 10)
Ururun Wolf:
http://battle-cats.wikia.com/wiki/Ururun_Wolf_(Cat_Unit)
Bahamut Cat:
http://battle-cats.wikia.com/wiki/Bahamut_Cat_(Special_Cat)
Who is better?