Portland OR to Chicago IL, What the Quickest Route?

Hey everybody, what's the the quickest way from Portland Or to Chicago IL, I know jumpin on a plane, but that's not an option. The I90 route or I80? It seems like we use to take the 80 to eastern Oregon then cut across Hwy12, thru some wilderness area to I90 at Missoula, somehow that saved either miles, or time, or both. Then I kinda remember takin I84 to I86 to I15 into Hwy30 thru Soda Springs down to I80 that way, and that was shorter or quicker or whatever. Man I can't remember it's been too long. Yes I did the Map things, Google, and Mapquest and some others, they seem to say it's a wash more or less either way. By either way I mean straight out the 80, or up and across on the 90. It's gonna be in about a month, so I'm thinkin the weather might be a little warmer, so less chance of snow and ice. So I can't really use that for a deciding factor. Well anyway I thought I'd ask you guys for your imput. And please don't give me too rough a time for not remembering, it's been quite a few years since I got to go that direction. Oh yeah, Thanks!!

 

Thanks kid, that's kinda the same info I was comin up with, kinda of a wash either way. I was just wonderin if any of the old timers remember any short cuts, or whatever. But I really do appreciate your response, and have a good one!!