What neck brace to buy ?

i am looking to buy a neck brace for downhill mountain biking. i did some price shopping to get the biggest bang for my buck. i am looking at the Alpinestars Bionic Neck Support and the Leatt Moto GPX Adventure Neck Brace Protection . i cant make a choice. i noticed some of these braces had chest straps, is that all important to have? here are links to the ones i am looking into.



http://www.extremesupply.com/LEATTMOTOGP鈥?/a>



http://www.amazon.com/Alpinestars-Bionic鈥?/a>What neck brace to buy ?
U can use it.This one best

LoPro Plus Mouth Guard (Black)

Product Features

-LOW PROFILE Design - Secures jaw creating TMJ/BRAIN SAFETY SPACE

- New 'STRAP/STRAPLESS' option attaches to Facemask, Shoulder-pads or can be used - Lanyard Style

- Translucent Outer Thermoplastic Protects Teeth - inner material secures jaw

$8,000 Dental Warranty!

- POWER CLENCH ACTIVATION designWhat neck brace to buy ?
i like the leatte because there known better and are said to protect better but in some cases they can actually brake ur colar bone if u crash hard enof

on the other hand i like the mobility the bionic gives u and alot of people say it protects ur back more than your neck im not sure if thats true and the bionick has never broken anyones colar bone because it has more room over your colar bones and the bionick is cheaperWhat neck brace to buy ?
go with the Leatt they make really good products that last.