21.5 iMac baseline vs. Retina Macbook Pro 13'' baseline. My uses - parallels 8 for office 2013 for school work, youtube, web browsing, movies, sketchup. Is the ssd but smaller screen better or the bigger screen but slower hdd? I dont generally need the rMBP for the portability as it will sit on my desk a majority of time, but will the ssd really help? I need some help with deciding. Thanks.