I think it depends on how difficult they are for you.
When someone is really focusing on doing an exercise for hypertrophy you need to focus on that muscle and if ideally keep as much tension on the muscle as possible. CT has talked at length about this. Poliquin has also discussed how the upper lats respond best to higher reps, fairly high TUT.
As an example, someones 8rm with dumbell bench might be 90lbs. But really concentrating on the muscle and squeezing and keeping tension, this weight is not doable, they might use say, 55lbs or 60lbs, usually it is quite a drastic difference, (same reason people say bodybuilders are weak). Now in my opinion if you are at your limit strength doing pullups meaning, you do 8-10 reps and you just barely keep good form the entire time and cannot focus on squeezing the lats or any of that, I would not say under those circumstances pullups are the best choice for adding size to the back. And often the muscle that will be hit very hard in these types of situations are the biceps IMO. For people that are quite strong on pullups however, and can do 8-10 controlled squeezed and maybe even constant tension reps, pullups IMO are incomparable as a back builder.
Also someone mentioned bentover rows, I know these are a staple in bodybuilding magazines, but I have always found that using a weight and a rep range that would be challenging for the pulling muscles, almost always prematurely fatigues the posterior chain (mainly lower back).