From an aerodynamic standpoint, the high wing airplane is more stable in roll than a low wing airplane. Of course, designers can use things like dihedral to equal out the "feel" of each design for the pilot. So you probably won't notice a whole lot of difference as an end result.
The high wing is located above the airplane's CG...and the sideslip force causes an "upwash" on the lowered wing. This creates an increase in lift of the lowered wing that creates a restoring moment in roll.
The low wing is below the airplanes CG...so the upwash on the lowered wing is not present...and actually causes a destablization in roll.
As a consequence, you'll see little dihedral in high wing planes...and lots of dihedral in low wing planes.
As a rule of thumb, the restorative sideslip moment of a high wing mounted airplane is equal to about 3 degrees of dihedral.
A low wing mounted airplane would be worth about 3 degrees of anhedral.
Again, bottom line, after the dihedral has been added to the low wing...I don't believe you will notice much difference in roll stablity
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