The 3 manufacturers in the US that I am aware of are Animas, Medtronic and Omnipod. Most people love the pump they are using. The biggest differences between them are taht Animas and Medtronic use tubing to connect to the cellphone size pump you have to wear. The omnipod is a bigger thing that you have to wear where you want the insulin to enter your body, but has no tube connected to anything else. (Omnipod will send you one to try out - without insulin).
Do your research and I think it is good to get opinions from people who use them. We chose the Animas Ping for our son because we decided the Omnipod was too big for a then 4 yr old. (I know there are younger kids that use the omnipod though). Then we wanted the smaller basal increments and the waterproof features. It also has the remote control to the pump in the meter, so that functions like the OMnipod PDM.
At the end of the day, they are all good pumps, so you will get a high quality device. Decide what is important to you and you will figure out which one is best for you.