This guy already made a comparison video on BOTW Wii U vs Switch. Clearly the Switch version is running much better textures/shaders and has a better draw distance. If you like playing the absolute prettiest version of a game the Switch is probably worth it.
This guy that is at the Treehouse claims a Nintendo rep told him BOTW will run at 900p when docked and 720 when portable.
http://nintendoeverything.com/rumor-zel ... able-mode/
While I am sure the hardware is capable of running at 1080 or even 4k, we will never see anything other than smaller eshop titles running at said res. Especially if Nintendos own flagship franchise launch title does not do so. Which is fine, I'm only a little bit of a graphics whore.
I guess where I stand at this point is I went from OMFG I LOVE THE SWITCH, AND I MUST HAVE IT DAY ONE! to "huh? maybe I dont need this day one..."
The presentation was one of the more underwhelming things I have seen. I just dont feel like they are giving me personally a reason to pick one up at launch. I will probably buy one a year or so down the road, just like I did with the U, once they have some games, as Wii U remasters and yet another version of SFII are not system sellers in my eyes.
As for you collector types, yeah you should preorder this. I imagine this will be a very similar story to a lot of other recent Nintendo products. I myself am still looking for that damn mini NES.....

