I climb a rope--dual rope (DRT) to be specific. While you can do it run and gun, it shines in situations where you can scout spots where you can hang a loop of cord to haul the rope over a limb--throwing line in the dark can be especially frustrating. It's also a bit of an athletic climb--sort of like doing the worm. But getting down is fast--you just rappel. With DRT, you get the rope over a limb and back down and tie a friction hitch (blake hitch) to make it into a big loop. Then you tie another knot close to the blake hitch that you clip into. To climb, you thrust your hips up and move the hitch up at the same time--this make the loop shorter, and you're 12 or so inches higher. 11mm rope at 75' is typical for DRT since you need to grip it. I use 66' of BlueMoon (11.7mm). Youtube DRT hunting.
SRT is the other method of rope climbing. It requires half the rope, and offers a little more flexibility. You can get away with a smaller dia rope. Also takes a fair amount of hardware.
If I was going to climb sticks, I'd get some Oplux Sterling (30') and a rappel device so you can get down without having to mess with a lineman's belt and ladders--especially in the dark. I would use my tether as a 2nd lineman's belt if I needed it while climbing.
I've got a set of Primal steps (like wild edge stepps) which are a bit of a pain to work with at first. They work similar to sticks. But I use them as a platform--I like them a lot as a perch. It takes me 5-10 minutes to set 3 of them, but they give me gobs of mobility around the tree and a zillion different ways to put my feet.
A lot of guys use aiders to climb sticks and Stepps. They up the level of risk (there's a risk of kicking out of them), but allow you carry less. I'd stay away from aiders/knaiders them until you get the feel of things.
I use a DIY saddle that's a clone of a Kestrel.
Anyhow, I'm loving it. It really opens up a lot of interesting options. And the flexibility up in the tree is great. I wouldn't say it's comfortable like sitting in a nice chair. But it's comfortable enough and looking around is easier, and you can shift positions easily, quietly, and with little perceptible movement.
All of this requires a little practice to before you hit the field.
As far as time in the tree--I'm limited by my patience and bladder. Peeing out of it is an athletic event, although I haven't tried toting a bottle.