On the contrary to Deltahater's username fitting review, I personally find the CR9s to be incredibly comfortable in F. I recently flew ORD-SLC on one and at 6'5" I was very comfortable and my standard size roll-aboard fit perfectly in the overhead. I'm about to fly SLC-ORD now on a CR9 and am quite looking forward to it. These are as comfortable as many of the mainline aircraft are in F, they just lack some of the amenities of the mainline aircraft such as in-seat entertainment or power (well, apparently the newer ones have power in F but I have yet to run across one).

And as an aside to Deltahater, SLC-ONT is less than 2 hours.

If the option is DL F versus WN, for that price differential I personally think it's a no-brainer.

ETA: I believe all the CR9s have wifi now as well as at the CR7s, but I could be mistaken on that.