Don't know about the Zoom. but the XT Live rocks.
Dean Icon PZ
Line 6 Variax 700
Dean V-Wing
Dean ML 79 SilverBurst
MXR M 108
H2O Chorus/Echo
Valve Junior (V3 Head/Cab and Combo)
VHT Special 6
Phonic 620 Power Pod PA
Wampler Super Plextortion
Line 6 Pod HD
^ on the other hand, i dont know about the Line 6 but the Zoom is great. i've tried it more than once and i love it. if only i had the money.
Ibanez RG321MH (Air Classic/Tone Zone)
Fernandes Telecaster (Twang King/stock bridge pickup)
Blackstar HT-20 (Scumback 55 speaker/ Tung Sol tubes)
TC Electronic Nova Repeater
Lava Cables Clear Connect, Soar and Mini ELC
hmm this is interesting
The thing is I'm buying online and i cant try either of them, and I don't wanna waste all my money on a piece of crap
The Zoom's 'Z-Pedal' looks pretty sweet; as well as its tube energizers, but I've heard mixed opinions about the quality of the effects, (Some say they're great, some don't like them) I reckon the Zoom looks sexier as well
As with the Line 6, its based on the PodXT, (the Pods get alot of praise around here, yes?) and I've seen it been recommended heaps of times (along with the X3 Live) as a quality pedal.