Depends what suits your needs.
Just bought a 2018 Colorado with V6. Coming out of a 2008 Colorado, both crew cab with the 5 ft. bed. For the way I drive and use it, can't justify the diesel's higher maintenance costs and and since I often do short trips around town, had my doubts about the regen cycle being able to run a complete cycle as much as it needed to.
On the 5 ft bed, true, its difficult to sleep in with the tailgate closed. It will however fit 3 storage containers, 2 5-gal gas cans, 2 6 gal water containers, a full size spare tire, a couple of toolboxes, spare battery, 20# CO2 cylinder, 5 gal shower, shovel, hilift and assorted boots and dirty clothes and a loaded trash bag or two.
For sleeping, there's either been a teardrop trailer on the rear hitch or an RTT up top.
How much more do you want to carry? It will also hold enough gravel to overload the suspension. I last tried to haul something the size of a sheet of plywood in 1986 (or was it 1987?) when I didn't own a truck of any kind.
Rear locker works pretty well although its not switchable. Smooth, responsive, reasonably able to move when you push the pedal. Yeah, I'm happy with it so far. That front under chin skirt will likely be gone soon. I put real adult-sized people in the back seat for 100's of miles at a time.
The aftermarket has choices for most anything, lifts, winches and bumpers, caps, skid plates.
Toyota holds its value better at trade in time, I'm told. Don't know that, my trucks tend to be pretty much ragged out when I get rid of them. In searching for used ones, the 1-2 year old Colorados seemed to be priced similar to new ones. Same for late model used Toyotas. Toyota has more aftermarket choices.
Nissan is dated but as pointed out above, its a settled design. Little experimentation. Aftermarket choices more limited but they're definitely out there. 1-2 year old models are better priced when you can find them. Some of the vehicles I've been happiest with over the years are those where the manufacturer is putting minor tweaks or added equipment to a settled design.
Its really a matter of what works for you, seat adjustments, general feel, etc.
For my purposes, the fit and comfort of the Colorado works while the others didn't as well for me.