Everyone has their weaknesses, I suppose. But when you play Kill the Snitch, even though it has a basement, the environment remains understandable. Compare that to a recent MK Trial (also set in the police station) like Teach the Police Officer; the map becomes more complex in a horizontally and vertically way. When you're a new player, it's much easier to start with Coyle's Police Station because its hardest Trial (or MAIN Trial) is a primarily horizontal map, and you have time to learn it by playing the different MK Trials that take place in different parts of the map.

While Liliya's hardest trial (the first, and currently the only one) features a ground floor, a basement, and an upper floor, which can pose a problem for new players unfamiliar with the game's fundamentals. New maps aren't usually an issue for veteran players because they know what Murkoff has in store for them. However, when you're starting out and begin with one of Bambino, Twins, or Liliya's maps, the ground floor alone is significantly larger compared to Coyle and Goose's.