Mag model 5 is the better constructed of the two from my experience. Then again, never trust just one guy's opinion on a pump, it's 50% installation, and 50% utilization.
2 - #5
1 - #7
1 - #9 - (this is a beast!!! Run it on my pond...)
I just changed impellers on a 5 and the 7... I think for the money... they are the best constructed... I would only a different pump if Mag didn't make what I needed...