Join Date: Dec 2003
Location: Oakland, CA
Bikes: '84 Ross Mt. Rainier, '97 Specialized Stumpjumper M2Pro, '98 Novara Trionfo TeamSL, '00 Novara Metro with Xtracycle
Fork mounts put the stress in a place the bike is meant to carry stress. Uprights can place strain on the downtubes and are not recommended for particular frame materials. If you have a disc brake, be careful to get a disc-compatible tray. Also bear in mind, how easy/comfortable are you with removing your fron wheel often.
Not being able to decide when I bought my system I bought two of each. The fork mounts are always on the car, and the upright mounts only come on when I need the capacity.
Go Fork Mount!