There are two points to consider.
1. If you and your doctor agree to do both treatments the same day, then you should do the laser first, followed by the Botox.
2. If you want to improve the results possibly, by having the laser resurfaced skin, whether by Fraxel Restore, Fraxel Repair, Ematrix or other lasers, then you can consider having the Botox, Dysport, Xeomin, done two weeks prior to the laser resurfacing so that the laser is done on more relaxed skin and when the new skin heals after laser it is healing on a smoother, less wrinkled undersurface.
Web reference: http://www.thenyac.com/botox/index.html