I'd say it's entirely personal preference, and I would start with 1 Quilter's Select ruler in a size you reach for often to decide.
I was looking to replace one of my rulers and tried a QS version of it. Didn't care for it - I found the fine markings and the color more difficult to read than others. I then tried the Creative Grids version and loved it and have purchased CG rulers for any I've needed since then.