I haven't seen the videos you speak of, but Tomodachi Life is a fishtank with quirky and strange conversations baked in. Your fish say and do wacky things.
Conversely, Miitomo is:
1 An "everyday life" survey
2 A terrible plinko minigame
3 Rarely, slightly weird photos/poses
From what I understand, the information it harvests is supposed to drip out to your friends.
Otherwise, this is like saying Theatrhythm Final Fantasy is a JRPG because it superficially looks like one.
I tried making multiple Miis but they only show up as wallpaper in the plinko game and never come to interact with my main Mii or even run the shop.
I don't see how anyone can get an interesting video out of Miitomo but I guess I'll have to fabricate a friend for my Mii and see if they actually do anything.
As for unlocking everything for free (your lower comment)...I can't imagine how long it would take to amass enough coins to do so. Shirts seem to average about 1600c, and you get 15c per question you answer, up until the invisible limit where it stops giving you coins for a while.
That means, you'd need to answer about 107 questions, and at about 3~4/day that's 1 month or so. If the limit is 2x that, we'll say two weeks.
Did I mention each color counts as a separate item, too?
I'm pretty sure Nintendo's going to turn off the server before anyone gets anything approaching the whole catalog through free plays.
Yes, they are starting out by handing people free bundles of 500 coins but there's way more clothing than even that will help.
So, I made a friend for myself and made friends with myself. You get coins for commenting on other people's comments and things, so with one active friend, you can probably make 1000 coins in a few days. I guess the point is to have a lot of friends answering the same inane questions, and making clever comments on them. The friend did show up once and asked a series of probing questions, as well.
I'm not sure why if someone really did have lots of friends, why they would want to go through this as an intermediate step in the communication process. T_T;