Free: Contests & Raffles.
I much prefer my smart phone to the GPS. It can be a bit of a pain pre downloading the maps if you'll be in an area with no cell coverage but the downloadable area is huge.
In the field I always use a GPS. It's more weather resistant and durable than my phone, has better battery life and battery replacement is easier and cheaper, and if damaged is less expensive to replace. There's no online/offline to mess: turn it on, and it works.
I run a phone exclusively. Bigger screen, better image, don't have to spend a fortune on batteries, already carrying it into the field anyways. Put a good case on it and the odds of breaking it are probably no better than breaking a handheld gps (no doubt a GPS unit is mlre stout though).
Rino. When I have the big one out there, it'll be nice to key the mic so they know where to find the body.