reason my preference is for an add on is because I need a big desk...it's about 6ft wide. not sure I could put a 6ft desktop on one of the frames.Not sure what brand is used in my office but look similar to Monoprice frame (I guess all of them looks the same). You can slap your own desktop on it.
Workstream by Monoprice Sit-Stand Dual-Motor Height Adjustable Table Desk Frame, Electric, Black - Monoprice.comBoost your productivity with increased workplace comfort and improved health with this sleek, modern sit and stand desk. Raised and lowered using a fast, quiet, and powerful dual electric motor automawww.monoprice.com