Its a very easy question to answer. The Schmidt Son has a five, yes a five year warranty. The Shimano has a one year warranty last I looked. Now the Shimano is not one fifth of the Sons price as if it was the Shimano might be competitive. Simple economics. I'm not saying that there is any inherent problem or issue with the shimano but they dont consider their product worth issuing with a 5 year warranty.
Hence in my opinion its a no brainer (for me - you make up your own mind) to dig deeper and buy the Son.