The Samsung Infuse has been very popular because it has an extra-large 4.5" Super AMOLED Plus display with extremely vivid colors. The Atrix 2 has a few tricks though, like a dual core CPU and a higher resolution 4.3" display. Gingerbread vs. Froyo won't be an obvious difference to an Android newbie, but it does offer some speed and minor UI improvements along with Google video chat. It's not an easy choice. The Samsung wins for the very large Super AMOLED Plus display, but the Atrix 2 wins for greater pocket-ability, a faster CPU and higher resolution display.
-------------------- Lisa Gade Editor in Chief, MobileTechReview