Honestly it doesn't matter which class you pick, any of them will help you burn more calories, get your heart rate up, and complete your workout routine with BodyPump.
Therefore - you should try them all! Give each class a few tries (I'd recommend four tries - it takes about that long to get the hang of it. On your first class, you'll feel very unco-ordinated, and some people think, "I hate this class", when often, they just hate the feeling of not being able to do it well. Once you have taken a few, you can then accurately assess whether it's for you.)
Ultimately, the best option is whichever class/es (you can take lots of them!) is most enjoyable for you, and suits your schedule. If it's hard to get to, you won't go, and if you don't like it, you won't go!
If you can do BP 2x week, add 2-3x of a LM cardio program, and maybe even mix in 1x BodyFlow (BodyBalance) that will be a great weekly routine for you.
Free the body.
The mind will follow.