Between the EX and the VTF-3, in testing, the VTF-3 has been show to have a flatter frequency response and a little better low end extension. However, shadyj, who owns both, has said,
Originally Posted by shadyJ
I have the VTF3 mk3 and the LFM-1 EX, they are mostly alike, and the differences are minor. The differences between the VTF3 mk3 and mk4 are pretty minor also. The down-firing ports are not a con unless the carpet is so thick they become blocked, you will want to have a little clearance for them. I would say the VTF3 has a slight advantage on paper that may not actually make a difference in practice. The VTF3 has more port volume than the LFM-1 EX which means it should be capable of more output at its tuning point. However, I can't tell the difference between the two, although I haven't tried pushing them hard enough in an attempt to notice any difference, because at that point they are both pretty loud, more than loud enough for me. I guess if I had to choose I would go with the VTF3, but only because of a few extra features and larger ports, but, like I said, in practice they are a lot more alike then they are different.
So between these two, you should probably base your decision on other factors such as do you want new with full warranty, do you like the look of one over the other, would downfiring serve your room placement better than the side firing of the VTF-3.