I started in PL, and because I was unfamiliar with the dynamics, I failed as a bear there. Moved over to SL and I haven't looked back. SL is a very well run game (as I'm sure PL is as well) but I've always been more of a sci-fi junkie than a fantasy one, so SL is an easy choice for me.

Plus, being on the new side of the game, it's awesome to see all the new tweaks & content that are going in place all the time!