They are both awesome games, and either will keep you occupied for a long time. I think my preference is for Sally's Spa because there is more to do, with beauty products to sell etc. It's also more of a challenge as there is an extra rating for each level - passed, expert and perfect. To get perfect on each level you have to reach the expert amount and have every customer leave the spa with full hearts.

Whichever you choose I hope you have a wonderful birthday. :)

I did finish the game. Think about varying your strategy if you are struggling with a level. On some levels you can keep people in the queue happy with the jukebox and concentrate on getting colour and chain bonuses to boost your score - just make sure you use the jukebox whenever possible. Other levels are more intense, and you need to focus on getting the people in, served and out, ignoring the colour bonuses. If one strategy doesn't work, try the other. Good luck!!