I've generally played center in the lower level league I'm in, and have found I do a lot of damage from the left corner during the cycle, because I'll be on my forehand circling up from the corner and can deliver a solid pass to every spot in the zone, or put a hard forehand shot on net.
In the higher league I play in, I was put on RW, and have found it's a much better side to make and receive passes from when you are near the wall, and you have a little more time to shoot, since you can protect the puck a little more with your body while driving the net...from the LW you can't always get around to the forehand to shoot.
If you haven't developed your forehand and backhand shot yet, I'd say it's probably better to learn to play RW first, it makes you a much better passer too.