Do you know what type of exercise you want to do Peppa? Cardio, weights, yoga/core/Pilates, HIIT, dance?
I like Body Attack and Step for cardio, but Combat is v popular on here too for that. Body Pump for strength (you can do with hand held weights if you don't have a bar) or Grit if you like HIIT - that's short, then BodyBalance is a mix of tai chi, yoga and Pilates, or Core - that's a shorter workout anyway. There are also some hybrid classes (or combo maybe?) where you can try out a mix.
I tend not to do short versions of things, I do the 55 minutes but stop when I'm bored. You get to know which tracks work or not for you, but obviously you have to have the time to do them!