Yamaha is majority owner of Schimmel. Action in the Schimmel is made by Yamaha. Actually in Germany, Schimmel is viewed as the Yamaha, i.e. less expensive, well-made but machine made, high-volume maker. Definitely a class below the Three B's (Bosendorfer, Bluethner, Bechstein), and Steinway. But a fine, well-made piano nevertheless. Schimmels are pretty similar to Yamahas. Brighter tone, excellent action, high-quality, and mass-produced with a lot of high-tech automated equipment.
You won't go wrong with either piano. Buy the one you like best. If you like them both, buy the cheaper one.