The App Store literally has tons of apps if you search for "pdf editor", just be sure and read the reviews. 🙂
Adobe Reader can't edit PDFs either, so perhaps your initial question/subject were a little misleading if you were also wanting something that could edit them. 🙂
I guess I'm lucky with Adobe Reader performing like a champ on my 2011 MBA i5/4GB/128GB. It's silky smooth even with 1000+ pages of colored textbooks and a file size of 100+ MB. I can also annotate with Adobe Reader and no slow down or anything. You probably need SSD on your MBP since I notice that really large PDFs loads a lot slower and a bit choppier on my friend's cMBP. My only gripe with Adobe is that it uses a lot of RAM (400 MB or more) when a large PDF is opened for a while.
I use preview sometimes but prefer Adobe's interface.