Keep in mind this is about low-touch. Typically people stare at a webpage with prices and buttons, and try to figure out if the service solves their problem, if it's reliable, if the UI is comfortable, if support is readily available, if other users like it, or how easy would be to transition from their current solution. Not so much opening a few of them and pulling out a spreadsheet to see which has most features.
What happens often is that you get a sale because you support some oddball feature.
Your best bet with SaaS is try to do that. Find a cluster of customers (realtors, doctors, train hobbyists) and over support their oddball features and get a good rep for supporting that vertical. Word of mouth within the cluster will get around (person to person, vertical forums, etc) and you will dominate that space. Once you are the big fish in that small pond feature set, branch outwards to other ponds.
