I usually don't like telling people exactly what to do but go with the ER....especially since you actually enjoyed it. Most "new grad" anywhere will have their horror stories. If you enjoyed it, go for it. Don't even entertain the idea of Med-Surg because just like OldDude alluded to, it is quite difficult to transfer to another department from Med-Surg (besides another Med-Surg department) unless its done "internally" (within the same facility) and that isnt always a guarantee. Get your foot into the ER, if you decide its not for you after all, then at least you will have other options available to you based on your (ER) experience.