Sketchup pro plus a few of the more useful plugins and Vray for Sketchup = top notch, fast easy and no worries about uvs. I've been designing booths with it for 3 years now. I come from a maya background and I still use it heavily but I find that sketchup is the fastest at least imo to create tradeshow designs especially if creating custom booths. I work for a company that does a mixture of custom designs and designs using standard bematrix frames or a mix of both. I took their 3ds max bematrix library converted it into a sketchup library and it's done me well.(They offer a sketchup library but the frames are nowhere near as accurate as the 3ds max ones.) I highly recommend looking into sketchup. my portfolio has some designs I did last year. josuer3d.com
Plugins I use are: round corners, select n isolate, pushpull, curvizard, shapebender, make face, escalate_displace and taper maker.
Sketchup also helps a lot when design custom pieces sent to CNC. Plus you can export your models into a pdf doc so if using a black and white line view of your model you can create some really beautiful build docs and graphic template files. You can be as detailed as you want. True to life measurement tools. It just works well.