AKA I don't know jack about sales and vote with my emotions the thread.
HOWEVER, even acknowledging this, I'm still going to give this one to FFVII. Here are the reasons.
1. The casual 3DS crowd I think will not be moving to the switch soon. My belief is that the success in Zelda and Mario Odyssey is largely attributed to the Male 18-35 demographic in the EU and NA regions. Gender skews in NA reports further this correlation.
https://www.resetera.com/threads/nintendo-shares-gender-and-age-breakdown-of-us-switch-buyers.2852/ Due to this, as well as an increase in price ($40 to $60 at least in NA) NH will not reach the same heights as NL in sales.
2. FFXV hit 9 million while being let's face it, fairly poorly received in comparison to other FF titles. Unless FFVIIR reviews somehow worse, I believe it'll line up somewhere around this territory. Yes the scope is reduced from a full remake but I don't think that should impact the game tremendously unless it reviews bad. The advantage of multiplatform cannot be overstated.
So as much as other titles received the 'switch bump', continuing middling sales numbers of titles such as Labo, 1-2 switch seems to indicate that the switch is STILL mostly composed a demographic that I feel isn't
as receptive of an AC title. I don't see this changing in the future either judging by sales performance of switch lite in japan (AC's strongest region) and other data.
Thus, in this instance, I give my vote to FFVIIR.