Just joined the Quest wagon. I also suffer from motion sickness on many games, but so far, the Quest is doing fine.
Beat Saber gave me a little uneasy feeling the first time, but not the second.
VR SuperHot left me fine.
I understand about the difference in graphics between the Quest and Rift, but figured with the non-cord bonus, I'd go Quest (OK, bought it for my son).
The other deciding factor was that new tech for VR will be flooding the market soon, each one better than the next, so realistically, this is a 2 year endeavor before moving on.
Too bad there is only Pinball FX, I just don't care for their "playful" animation. Maybe I'll grab that link and then use the cord for a Rift pinball program.