The corner auger cart is much nicer to run and will clean out better with wet corn.  There are a pile of 672/674 carts around here and they have been bullet proof.  We have ran Brent carts since 1998, first a 472 and then traded for a used 774 in '04 and our total repairs have been one U joint cross, two hydrualic hoses and I had to weld on the auger cylinder mount a couple years ago after running over a bunch of frozen ground. 


Also the Brent will probably have much bigger tires than the EZ Trail and if it's wet at all you want the biggest tire you can get.  Alot of the 672s around here have 24.5x32 tires but 30.5s are better if you can find them.