which should i purchase (tetra or sonus faber)

I would second the Tetra's. I have owned both. Sold the Sonus and still have the Tetra's. Have to be heard.

I prefer the Tetras.
Superb design and manufacturer support. Their cables are excellent too!

As to the sound of the speaker, that is far to subjective of a factor to lend itself to anyone's opinion other than your own. Suggestions from opthers as to other models / brands is of value in awareness of what to audition. In short, repeated auditions is the way to make the choice. Of course, practical buying concerns also have their place as in any other purchase, such as, does the manufacturer provide support, has the company been around for a while (availability of repair parts if needed), is there a negative consensus as to defects.

I agree with Tvad..buy what sound better to you..I do think SF has a better re-sale value/easier to sell..thats always a point I take into consideration when laying money down

It is such a pity that most of us also have to consider the resale value when purchasing audio equipment. I rarely do not care if the price is right. It is very sad that Tetra cannot hold its value because they are not known by most. They are FANTASTIC! They do not get the attention they deserve. Hopefully, Tetra will change this or maybe they do not care...