Don't worry about the focus motor, both Canon and Sony do just fine in this area for casual photography and home-use video.
Also Nikon cameras do not make noise while focusing. You must have heard a d5300 being used with a defective lens.
How long are the videos you plan on making? Are they the typical VLOG style?
If they are vlog style, you don't want auto-focus. It will cause any camera to hunt in and out of focus during the shoot. if it is not vlog style, but more action and such, you should get a more action oriented camera than the ones you are considering If you want to be able to do a single take of over 30 minutes you need to either get an actual video camera or get a Panasonic GH series camera..
I have shot the Sony mount, Canon mount and Nikon mount. I prefer the Nikon. If I were to try to make an "artistic" or particularly high quality video, I would use one of my Nikon full-frame cameras. If I were to make a mid-tier video (decent quality) I would use my Panasonic GH camera. For casual video or video in poor weather I typically will use a Sony rx10. The Sony is not a DSLR, it is not capable of as thin depth of field and lacks the special types of dynamic range that larger sensor cameras can produce. But it has a decent size sensor (1") and a very good lens (24-200mm f/2.8 constant aperture).
I use the GH3 to record all sorts of events (concerts, etc). it is weather sealed and if I used one of my weather sealed lenses it is fine in the rain. However for sporting events I typically use the rx10 for video. I live in the Seattle area where poor-weather is nearly a given and with the rx10 I never have to change lenses. For still images (including sports, events, etc) I mainly use my Nikon d750.