Both emulators requires a work horse.
the CPU clock rate is going to be the most important pieces. The integrated graphics. is going to be an issue, they are never a wise choice, and the laptop top the other issue. Remember your laws of physics. In short the large of the two are going to work better. I think the Mac has better specs but guessing its smaller? Though as pix said the 3635QM can nearly hit 4g where the other closer to 3g. If you can keep the 3635QM cool, its going to do a better job and PCSX2 emulation is not going to work well on anything under 3g.