Behringer Vamp-X only selling point is that its super cheap and most bang for the buck, due to it having practically all the features you can think of.
The cons about the unit, for one thing is that firstly it looks like a toy with it's cheesy plastic shell, not for gorilla-sized guitarist.
Next con on this effect pedal is that you will probably spend 1/2 the day figuring out how to navigate and use the features on this pedal.
Yeah, it has that expression pedal which you can assign to the possible uses, but the feel on this is not very condusive.
As it's a new model, I have yet to see it coming in for broken parts yet. But I have already come across 2 cases, one require hard reset, other cannot be helped, as I felt the D/A section is damaged. So the processor is not very robust.
About Zoom, is that it's definately a more robust pedal. Sound wise I think should at least be on-par or better. Remember they are both digital effects. Only thing I seen not so robust is the input jack which a few tend to fail after the warranty is over. But I think is due to user usage, so is still a thumbs up, as the user has used it till it wear out. User friendly is another plus point. Price wise is still quite competitive as compared to the likes of roland or line6 has to offer. But loose out to the vampx in terms of value for money.
Well, value can be said to be like beauty, so it's comparision is only as far is the eye of the beholder goes.