Gossip Girl, no doubt about it. Though season five was dreadful and season six was messy, it had great characters, good acting, and fun plotlines. I've only seen a season and a half of PLL but while I thought the acting was good, it just felt a little eh to me and wasn't my kinda thing. I saw a season of 90210 and loved it but never continued.
Queen Georgina Sparks > everyone on 90210 and PLL.
