the biggest factor is what grease is used... then seal drag comes into play... Sealed "Cartridge" Bearings have Twice as many seals involved.... and more balls pushing through the grease...
seeing the "spin test" posted above makes me laugh... the weight of the rim, tire and spokes is not mentioned at all, and there was no standard for RPM at the start of the "test"... etc.
also... the hubs' axles are QR type... guess what changes a bearing's SIDE loading when set differently... a QR.
note #2... the "normal" hub is a Box Store Tourney hub, on a Mongoose...

i've always had best results from cup/cone hubs, as far as least resistance.... and the Shimano Hub grease works fantastic... my original Dura Ace hubs are still working perfectly, since 1983... they were re-greased every year when my Trek was my only bike, and only transportation.

as a kid, i used light weight red silicone grease that was made for my Aurora HO scale cars... it worked very well, and i could find it easily then. that grease was in the hubs of my Mitzutani SuperLite factory race bike when i hit 53mph on flat ground... and also when i hit 72mph on that same bike riding west from Government Camp, Oregon on Hwy 26.