I'd recommend bucket wheels over silent spinners. The 12" silent spinners can have stability issues; it's a very poorly designed wheel, and theyre not cheap - and it's not uncommon to hear them break. They can rattle too, which is incredibly annoying, and need to be dismantled to thoroughly clean them.
For sanity sake (ease of clean and a peaceful nights sleep!) I agree with Mecki, and would recommend you look into Bucket wheels. The only noise I hear is the pitter patter of feet, and the smooth surface makes them super easy to clean.