I usually don’t wish others on their birthdays in Facebook. Normally a birthday wish is meant to show that you’ve remembered his/her birthday because him/her is special to you. But in Facebook you get a notification on who have the birthdays each day. Which renders such a wish useless.
If you really want your wish to stand out, be the first person to wish. (Even being the last will do). This may not be an easy thing to do. Especially being the first to wish is the hardest. Or you can send him/her a private message as a wish instead of writing on his/her wall.
What have I written? Okay, I should publish this.