I haven't been in anything but the waiting to O portion, so I cannot weigh in too much.
From my experience though, I would say they are both so difficult in their own ways.
1) Waiting to O is stressful because you can miss your chance, and you freak out at any changes in cm and your temp. Then, I worry about my husband. While I am 25, he is 38, and I worry that I am just draining him if we bd too often. That's why I am trying to be very careful and not waste his energy too early on. I am waiting until I see ewcm or that 3 day fertile window. He's prepared to bd every day in that span, hahah and he thinks he is excited for that much action. We'll see what his opinion is after all that!! I am making him take zinc for his own renewal

Reload that gun for each night.
Then... Even if your cycle is regular, then you are watching the clock tick so slow waiting for good ole timing to kick in. Bleh. Waiting. hahah
2) The TWW then holds the fear that you didn't bd enough. I'm sure you could bd twice per day every day for the week before and including ovulation, and you would still worry it wasn't enough. Then, if you are like me (because I know I will be this person, no matter how hard I try not to be), you will spend each waking moment symptom spotting. Sheesh. Each part, while exciting and wonderful, is also a total mental game

The good and the bad make it worth it? I guess? haha
I just remembered that I do have some news, albeit boring. I just realized that I forgot to mention I am a

addict. While the caffeine has an obvious effect on me when I cut it out (headache, and foggy head), I don't drink it to wake up. I just love it. Since I do count calories, I look forward to the 1/4 c. whole milk I put in it. A little snack that takes the edge off of hunger while I am working in the morning, and then again in the afternoon, and the flavor is so comforting to me. Right now, I am sipping my morning cup of coffee, and I am getting ready to cut out my afternoon cup. They are small cups-- not coffee shop-made at least. I know that I had to go cold-turkey (instant quitting) when I got that

with my beautiful boy. Detoxing in finals week sucked! haha I have no reason not to cut it out now and prepare. I really just enjoy the flavor. I will keep my morning cup until after O, and then I will take that one away. It never gives me energy, so I know I won't be missing that, but I really do look forward to that sip.
I just made it sound like I am crash-dieting and all I eat is coffee haha. I eat plenty. As a matter of fact, I am just under maintenance calories and still losing a very little bit each week. Slow and steady helped me lose 45 lbs and not miss a thing. The coffee with the milk are nice between meals and snacks though. haha I promise I am eating plenty! hahah

As soon as I get that positive, I will talk to my doctor about the amount I should gain for my weight, and I will reset my goals to that amount for a healthy gain. If left to my own devices, I'm sure I will get back to my starting point... but that's a discussion for another day