Better question is what is c0nfused showing that your brother isn't? The specific app between the two of them is important, but also everything else. From the headset hardware; at the extreme ends; Oculus vs Google Cardboard. Also important is what add-ons they both have - seeing your own hands inside the headset is remarkably important for immersion, which is kind of the point. Also important is the level of preconfiguration - if the number of times the presenter says "wait hold on", and then goes to futz with the settings for 5 minutes isn't zero, then VR is a total turn off and, eugh, I don't want one. The cables going to the headset are critical as well - wireless isn't here for VR yet, but if there are multiple tangled cable messes rather than a single zip tied set of cables, I'm not going to want one in my living room if it's too complicated to put on and is just gonna be a mess in my living room.

It's entirely possible the two crowds being presented to differs by that much, but there are so many other variables in play too.