The main difference that I can think of without consulting the specs sheet, is that the Fly Creek only has one door.
Try not to get overwhelmed. Find, say, 4 options that interest you. Lay out all their specs into a document, weight, material, features, single-wall vs. double-wall, trekking poles vs. dedicated poles, freestanding vs. non, etc.
If you need help figuring out what any of those terms mean, googling will yield tons of results. Andrew Skurka's gear guide by National Geographic also does a good job explaining the differences in types of shelters, both tents and not.