Assuming you don't IV (and I wouldn't advise starting to), I'd say snorting.
I find smoking meth to be wasteful, unsatisfying and compulsive. It's virtually impossible to get a decent hit in one toke, so I end up smoking more and more, chasing a high that's never going to come. Besides the novelty of the process, I think smoking it is pretty crap. Also, it is easy to just sit on your arse smoking it all night, leading me to seriously question it's efficiency as a method of administration. Frankly, I wouldn't be all that surprised if I was told that 50% of the drug is destroyed/wasted in the process.
Eating gives a pretty good feeling, but can be hard on your stomach (it gives me stomach aches if I eat quite a bit) and it tends to drag on, without giving a real peak. Try it though, and if you like it, go with it.
Crushing the shit out of it and snorting it is good. While it can be hard on the nose, you can have as little or as much as you want in the one go.
A large amount at once will give you a decent rush when it kicks in, you'll feel alot more charged than when you smoke or eat it.