None of my devices have crashed (Xperia U on ICS, N7 on latest JB, Wildfire S Rooted, Custom (WC3) ROM. Generic Allwinner tablet on ICS. In general use there's not that much apparent difference inspeed between the tablets. the main differences I've noticed are:
N7 has MUCH better screen, WiFi connectivity and Battery life. It's also faster rendering web pages and is a better GPS than my Garmin.