We don't sell either so here is our take we have heard the DI and used to sell Vandys a million years ago.
The Vandys big soundstage not particularly well focused in image, warm midrange, warm top end, bass response is relatively deep not super tight.
A very musical easy to listen to loudspeaker not great for detail freaks, easy to drive, plays decent volume, not the best head banging louspeaker, not super attractive.
Tekton's big layered soundstage, warm midrange, warm top end, deep tight impactful bass, fit and finish not spectacular. Also not hyer detailed very easy to listen to, easy to drive, highly efficient, great at playing loud,
Box is very big and very square looking. An incredible buy for the money nearly impossible to demo, yes they have a return privilage but that will cost you $300.00 vs Vandy which has a superb dealer network and the longevity of an American classic high end brand.
If you want a much more attractive speaker then eher of these with much greater treble resolution, unbelievable ribbon tweeter, seek out the new Quad Z3 which price has just come down from $4,300.00 to $2,999.00, not as much bass, similar efficiency to the Vandy's plays relatively loud but not as loud or as low as the Tektons. We love ribbon tweeters and the Quad's tweeter is detailed with out the hyper detailed sound of many ribbon's.
The reality of this discussion these two contenders are both excellent.
Dave and Troy
Audio Doctor NJ