The difference between them is time and what goes on the nail
An express manicure and a structured gel are not the same service at different prices; they are different amounts of work. The express is a shape, a tidy and a coat of colour, and it is honest about being short. The structured gel builds a thin apex over the middle of the nail so that a soft nail cannot flex under a rigid colour, which is what cracks an ordinary gel manicure at day twelve. Everything in between is a point on that line.
Which one you actually want
If your own nails are strong and you want colour for a week, a classic manicure in regular polish is the right answer and it is the cheapest thing on this page. If your polish is chipping in three days, that is gel. If your gel is cracking at day ten, that is structured gel and not a different colour. If your nails split at the side walls or peel at the free edge, that is a builder gel overlay, which is a strength problem rather than a finish problem.
Dry or wet, and why it matters
Most of the manicures here are done dry: no bowl, no soak, cuticles worked with a fine bit rather than softened in water. Water swells the nail plate, and a gel applied to a swollen nail lifts when the nail dries out again. The classic manicure keeps its soak because it is finished in regular polish, where the soak costs nothing and the warm water is half the point.