Duocircle is one of the lesser known players but they have several 1000 customers and their website messaging seems very corporate esque. They do not have much transparency on what they do how they do.
In fact their brand name and product offerings are not clear about what they do though they claim to be in same market. You can choose us or them based on your comfort level. If you want established player with corporate brochures then they are the right choice.
If instead you like to work with technical people who are passionate about technology then we are there for you. Choice is yours. We do not believe in forcing anybody into any ideology.