It's not rocket science tbh it'll likely be a scaled version of the PS4 version with the idea of giving that version more sales as it's the more expensive one to develop, 3DS will outsell both combined and after the below par performance of XV in Japan due to the decline in home consoles the Switch version will likely be the one they're banking on to make up the sales to cover development costs.

DQXI doesn't look that complex for the hardware to run especially given how DQ games, DQX has a version running on the 3DS for reference.

DQX isn't a very good development landmark for the series. It's a weird entry that has been ported all over the place to try to get more sales and keep a reasonably sized playerbase as an MMO. It may be the most ported MMORPG ever, but I'm not willing to Google my way to a definitive answer there. They made a lot of sacrificies to get the game on as many consoles as possible.

Also, you can't compare XV sales to DQ in Japan. Dragon Quest is much, much more popular while Final Fantasy gave up around the end of the PS2 era and decided to shift focus over to Western appeal. I would not be surprised to see Dragon Quest XI break 4 million in Japan alone. The new numbered entries always sell well no matter what they release on. Even DQ IX on the DS pushed 4.35 million sales in Japan.

Knowing that is also why I question the placement of the Switch version. They don't need it to make up for the PS4 development because 3DS sales and the international release will more than accomplish that. The PS4 version won't sell as well as the 3DS version, sure, but I still won't be surprised if it pushes over a million in Japan while the 3DS version does something more like 3 - 3.5 million.

That's some serious level of spin there, if the Switch version of DQXI is like the PS4 one is obviously the best handheld version period, and since it offers you portability that could easily be a selling point over the Ps4 version for many people, specially on Japan.

Graphics don't suddenly make the best version of a game. If the 3DS version is technically superior in what it sets out to do compared to the Switch version, the 3DS version is the definitive handheld iteration. The difference will be that the 3DS version feels like a handheld title, while the Switch version may end up simply feeling like a significantly inferior version of the PS4 title. I won't make any assumptions about how much Japan may or may not gravitate to the Switch, but I doubt they'll buy a new console to play the lesser version of a game when they would be perfectly content with the 3DS version. Considering how long Japan was willing to hang onto the PS3 before jumping to the PS4, I doubt the Switch is going to usurp the 3DS in time for the DQ XI release, particularly with its ambigious nature as a half console half handheld device.

It isn't spin when there is such a significant level of uncertainty. My realist outlook beats blind belief that the Switch version of the game is going to occupy a hole in the market that has already been filled.

I will probably get this for switch... i like the look of the game on ps4... but i travel a lot lately and would probably prefer the look on switch than the 3ds

Yeah graphics don't make the better version of the game yet everybody here agrees that the ps4 version is the best one just because it looks way better than the 3ds version, this double moral disorients me. 

I think that's just because the PS4 version will be the bigger adventure as an expected evolution of Dragon Quest. There will be substantial gameplay differences, and I won't be surprised if the 3DS version is the best version to a large portion of the population just for maintaining the classic JRPG formula in the face of modern RPG expectations.

Actually I can compare XV because the context is in reference to performance, XIII sold 1.5m or so first week while XV did less than half of that, it's an indicator of the decline of consoles in Japan. DQXI will not do 4m on PS4 hence why a 3DS and Switch version were green lit long ago even before people knew what Switch actually was, at this rate I wouldn't be surprised if the PS4 version doesn't break 1m.

DQX is no different to what they're doing here, the 3DS and Switch versions exist to generate more sales as it's clear that consoles have declined in Japan and SE is aware of this, the era of consoles in Japan ended with the PS2.

Correlation does not equal causation, and thus your argument falls apart. It's fear of a potential failure of the console market that led to the 3DS version also being developed, not guaranteed failure. You seem to think the console market is dead despite a steady increase in Japanese PS4 sales for the past year and sales success with the Slim and Pro. The console market is still healthy which is why tons of games are still developed for consoles and not just 3DS, Vita, iOS, or Android. You seem to think no Japanese person has touched a home console in a decade now. Your argument legitimately makes no sense and is grounded in a relatively baseless assumption.

Edit Re: FF Sales Decline: That can be attributed to multiple possibilities. FFXV had a much more western development approach and XIII burned a lot of people. I would not be surprised if that significantly impacted the sales potential of FFXV.

You mean it wasn't already? Well if Nintendo was being unnecessarily coy with this, then hopefully it's the same deal for the games in the Switch trailer. As for Dragon Quest specifically, one of these days I should give the series a try.