I have owned both in our studios. We started out with the v amps, based on cost, however I ran a Pod Pro.
After about 3 months, I drew some conclusions. The v amp is good value for money, however the replication of the harmonic breakup attributed to high gain amps did not cut it near as well as the Line 6 does. This was what marked the Behringer down in comparison. If you were strictly a clean player, then the v amp is pretty good. The v amp clean sounds are good, maybe they lack a slight bit of body, but overall they are good.
Funny to note that out studios run Dual Pod Xt's and Pod Pro XT's currently, however we have just bought a batch of original Pod Pro's. This was mainly based on the overall body sound created in the Soldano and Mesa Boogie models. They are great on the Pod Pro XT, however the Mesa TreadPlate and solo 100 sound don't sound as full as the original Pod Pro presets of the SLO 100 and the Rectifier. Obviously there are more paramters to play with on the XT's not to mention the USB feature, however if the 'tone' is primarily what you are after....
Some ppl may disagree and thats fair, we spend upwards of 30 hours a week with the gear and a good chunk of time is using the distorted presets/models on the gear, so this is what we believe our ears are teling us.
Thats my thoughts on it for you....