Just my two cents, but you hire an agent, hopefully a Realtor. You do not hire a company, per se.
I would be happy to refer you to a top Realtor. You can contact me directly for details.
The brokerage is not going to sell your home...the Realtor is who you hire.
I would reword your question to say ..no matter what office ...which COMPANY does everyone consider the biggest, greatest and most tech savy...... COLDWELL BANKER... without a questions! We have the biggest web presence as well as a huge international presence. Because of the size of our company there is little competition. We have offices in DC, Chevy Chase and downtown Bethesda that are THE BEST! I would vote the downtown Bethesda office #1.
Well known for its tech-savvy'ness in DC is Darrin Friedman's COLDWELL BANKER office in Chevy Chase. I happen to be a member of his office, but that's beside the point; check the blogs and info-sites by his team. Everyone here is up-to-date in all ways, but also has those all-important, city-feel and legality-things, under their belt...oh-so-necessary in this city-of-laws and lawyers! Cheers,