This is only my opinion so take it for what it's worth: At one time when most bike had basically the same geometry you could look at the length of tubes or stand over height and pretty much pick the most comfortable bike for you. Now there are so many differences in geometry that you almost have to get on one and see how well it fits. Case in point is the old KHS I rode for a year. I always seemed really cramped and it felt like the bike was to small. My new raleigh (same size bike 56cm) has a shorter top tube but higher head stem and is way more comfortable.