Re: Which Modeling Practice Amp?
I have not owned or used the specific models cited. I currently own and use a SansAmp PSA-1 rack unit. Previously I used a Line6 Flextronics III for almost 10 years until it died.
I have played a Vox Valvetronics 120 and have been in a band with a guitarist who played a Spyder. Depends on the sound you need, but my takeaway is the Line6/Vetta engine stuff was the best if you have to change amps and styles frequently, but the Spyder line didn't sound right to me - sounded more like cheap copies of an amp. The Vox was the best at doing Marshall / Plexi sounds, better even than recent Marshall EL-34 combo amps I tried at the same time. However, I do not know if the VT40 is using the same sound emulation at the VT 120 was.
Also, with a smaller format and speaker, that could take away from a good emulation. I guess as long as the cabinet is a good solid cab, with good wood or the right number of plys, and at least 12" speaker (which could be upgraded if needed). If you can, play them first. That in person trial really made all the difference in making a good decision for me.