Pre-construction, all you're buying is a piece of paper. Bigger the risk; lower the price. You really want to consider what things like a hold up in construction—say the municipality wakes up to some environmental weirdness and says "Stop"—means to your investment, or the builder can't cope with higher lumber prices because the US market suddenly re-opened.
If you have very little money laid out, and can afford to wait, fine. But the more the time weighs on you, the more you need to really look into what guarantee you have that the building you hope you're buying will show up on the day you expect. I'd say that's more important than location.
What makes a "better location" to you? The one most people are rushing to buy in, so you can resell. Their Real Estate Boards and Boards of Trade can give you numbers. And if your piece of paper's solid, you can resell that w/o waiting for the bricks and mortar.