The best one is the simplest one when you are first starting out. Use recipes to learn, but keep the grain bill simple so you can see what the various grains do. Don't get addicted to recipes, and always remember that no matter what - you will NEVER duplicate what someone else has done, and any "clone beer" you brew will not taste like the original. There are too many variables, and your brew system and techniques will be different.
Just brew up a simple beer with a base malt and one other grain. Learn what the various grains taste like. For instance, brew a basic Pale Ale - 8-9lbs of 2row, and 1/2 lb of Crystal 60. 35IBUs, and a few ounces of hops to finish. Simple, easy, and good. After that, experiment by replacing the Crystal with another type of grain, and see what that tastes like. Maybe double the amount. Change hops next time, or double the flavor additions or whatever.
In the beginning, if you use recipes with a several different grains - you may make good beer, but you won't know what the various grains are doing for you. Complicated recipes don't equal better beers, necessarily.