Great post! I see better improvement in periodontal health with the Sonicare brushes over the Oral B spin. I think maybe because the size of the toothbrush head. A lot of my patients miss the gum line when they report using the spin brush. Sonicare 4100 is a great/affordable brush. Comparable in price to the one you listed. Sometimes it even goes on sale at Target for $40!

Philips Sonicare ProtectiveClean 4100 Rechargeable Electric Toothbrush, White HX6817/01 (Packaging may Vary) https://www.amazon.com/dp/B078GVDB19/ref=cm_sw_r_cp_api_i_w4wpEbK1FZ67M