Digging into the stats a bit, they look extremely similar. Here are the few differences I noticed:
1. Battery life: 8 hours (Acer) vs. 9.5 hours (ASUS)
2. Weight: 1.7 lbs (Acer) vs. 1.5 lbs (ASUS)
3. Front Camera Resolution: 2M (Acer) vs. 1.2M (ASUS)
Aside from that (and the dock feature), they're probably about the same.