I prefer St. Louis style, but there is work involved in trimming them properly. Some trim them, some do not, but I like clean bones without the cartilage.
Baby Backs are usually ready to go, jut pull the membrane off the back.
Beef ribs are great, but I would not recommend them for your first few cooks.
Good luck and keep us posted..
Humphrey's DownEast Beast W/BBQ Guru