RBK40 vs RBK50V vs RBR753

Just my two cents.....

Buffering may or may not be related to the Orbi router.  With that being said,

• It is not the number of devices that counts.  It is the network load.
  People report over 100 "devices" on a single Orbi system.  If the bulk of them are "Internet of Things" (IoT) gizmos that may send two packets an hour, they present almost no load on the router or the ISP connection.
  If there are 6 computers streaming Hi Def (4K) video, that is considerable load.
  Consider, however, that 4K video requires about 25mb of bandwidth.  8 devices streaming at once will require only 200mb.
  And, typical Zoom meetings stream very little data compared to 4K video.
• The "50" Orbi package has potentially greater backhaul connection between the router and satellites.
  All backhaul connections are affected by building construction and distance, but it should be higher than the "40".
• There are reports that the "50" may struggle with gigabit internet connections.
  However, it probably can process more than you need.
• The AX product has some advantages over the "50":
  *  The potential backhaul link between router and satellites is even higher.
  *  It "future proofs" your WiFi with WiFi6 (future purchases of laptops, phones, tablets, etc.)
• The situation with regard to Parental Controls is murky
  *  I do not know if the AX supports Disney Circle.
  * Netgear appears to be ditching Disney in favor of an in house product, which may or may not work with the AX (when?)

Is this confusing?  Yes.