I just got a Forerunner 305, has anyone ever used either of these mounts and can you tell me which one works better? The first one is definitely more secure but the second one seems like it'd be a good idea for tris.

http://www.amazon.com/Garmin-010-110...1594971&sr=8-1

http://www.amazon.com/Garmin-Forerun...1595006&sr=1-2