REALLY, BOTH ARE BAD NOT UNLESS YOU ARE A VERY GOOD RIDER. EITHER WAY, YOU GO DOWN AND THE CHILD FOLLOWS. I HAVE SEEN MANY PARENTS BOTH IN A CHILD SEATS AND TRAILER TAKE THE SPILL. IF YOU MUST, THE TRAILER ALWAYS WORKS BEST AS THE DISTANCE FOR THE CHILD TO REACH THE GROUND IS ONLY ABOUT 2FT...