It does't matter whether the brochures are either two- fold or three- fold as it becomes very nice when it goes through an aesthetic experienced expert's hand. In an end-user view, we need quality bearing outcome forever.
In that case we need to analyse which of the companies are providing better resultant to the clients. The SBL comes one of the best quality output rendering firm for all of the Graphic design purposes. You can see this link to know more, http://www.sblgraphics.com/brochure-designing.aspx
They have proficient professionals for all of the grahic design purposes.