Without knowing every last detail, I'd suggest considering the one with 64GB storage. 32GB disappears quickly. Or else do more digging to see how much you can unload to an external card, and how that works on W10 vs. W8.1.
If you confirm you can live with 32GB+microSD card, then I'd go for the Lenovo. I tried out this tablet in Best Buy and preferred the 16:10 aspect ratio (especially in portrait mode). I also liked the battery barrel and how it made the tablet feel lighter and better balanced when holding in portrait mode. The speakers were also good. Finally, the built in kickstand was nice.
I do like the overall apearance of the Lenovo over the Dell.
32GB + 64GB card should be enough but I'm not sure.