When I got my DS I got
Mario Kart- happy
Mario and Luigi Parnters in Time- happy
Tetris DS- happy
Ridge Racer DS- eh
This is what I got right off the bat that I can recall followed by New Super Mario Bros (Happy) a few months later.
When I got my Wii I got
Wii Sports -happy
Mario Kart Wii -happy
Super Mario Galaxy- happy
Super Paper Mario-happy
Super Smash Bros Brawl-happy
Mario Kart came out as I finally got a Wii
Really no one game got me to buy them. But, it was Nintendos first party games that did, which is what makes me always buy Nintendo consoles. I have since added many games from Nintendo and from 3rd parties to both over the years.
I almost always buy a system based on what 1st party has to offer. I had Sega systems because of Sega I had Sony systems because of Sony too. Only once did a 3rd party game have much influence and that was FF 7, but Crash Bandicoot is what tip the scale for me to get my PS1