Either would be good.
The Mag3 may leak at the impeller housing without the addition of some goop, and tends to crack at the hose threads, but this can be prevented with a hose clamp around the the outside of the hose thread. The Danner's also tend to emit substantially more magnetic field, which may result in CRT issues.
The Eheim 1250 costs more.
I'd be surprised if you could even tell the difference between the performance of the two pumps unless you were using something better than motherboard sensors.
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