To me, Pathfinder isn't in competition with 3.5 it's a new version of it. I've played 4th edition and found it flavorless and too dependent on the daily and encounter power system. The Pathfinder Corebook is everything I liked about 3.5 with a lot of little, logical tweaks that make the system work better and make more sense. Beyond the corebook you get into the really good stuff in Pathfinder, new and interesting Classes, and a ton of personalization options. Of course it all comes down to personal taste, but I enjoy the direction Paizo took 3.5 whereas Wizards seems to have lost something recently. I won't be one of those guys, venomous, mean spirited and misinformed loudmouths, but I really don't like the new face of Dungeons and Dragons. I've embraced Pathfinder and don't regret my decision at all. D&D has drifted away from roleplaying into the realm of tactical combat. I'm not saying Pathfinder is perfect but it's my top choice