Model railroad layouts come in a wide variety of scales and a model railroad show is an ideal place to compare scales and decide which appeals to you. In addition to admiring the scale layouts, check to see what local vendors offer in each scale. For some scales you may have several local sources of material, other scales may require importing stock or scenery, yet others may attract people who like to build everything from scratch.
As the label details don't show well on this photo the scales shown from top right down: HO scale, N scale (to left), S scale, Z scale (to left), O scale and G scale.