if wall thickness is  same on  both  spears,  I'd  go with the one  that doesn't have the ball on it yet.
lower arm mounts are in  double shear +  riser has  gusset.   
     It does have the  hole for the  top spear in a bad spot-  right in the middle of the  riser..  

be aware when dumping loads,   that  when the dump box   nears the  critical angle, it may put  a  quick negative  force on your  3 pt.. and could  make the 3 pt  snap up against the cylinder stops or what ever that tractor uses to limit  3 pt  travel.  maybe  put a  safety  chain to limit  how high it can lift.   
Most of my  3pt,  gooseneck use is  close to the bottom of the  3 pt.  range.   

mine is a Winkel mfg... without the bale spikes.  I've used it  pretty heavy for only about 5 yrs,  and  no cracks yet.  
Notice  the distance between the top of the ball,  and  the main cross piece is shortened up,  and  the  gussets are  wider.  
My original  re-purposed   'hitch' was a  spear similar to your's,   and  the vertical tall riser started cracking fairly soon.  between the tall riser,  and  the  thinner wall,  it simply wasn't heavy enough for  what I put it through.



    

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