I am using the Medtronic 780. It can be used as a stand alone pump. This enables you to programme the pump to give different amounts of background insulin hour by hour throughout the day. You can also turn this up or down as appropriate to suit the different levels of activity. It is a lot more flexible than injections, but does require some work to get it set up to suit your son.
I have always used pumps with tubing, as it gives me the flexibility to put the cannula anywhere I want. The tubing is tucked away under clothes so does not cause any issues.
The book by Gary Sheiner Pumping insulin is excellent but not necessarily an easy read, until you actually have a pump.
Many pumps, including the 780 and tslim can be used in conjunction with a sensor which will then enable the pump to give alarms when you are going high or low. Each pump links up with a specific sensor.
It is great that you are doing your homework now. Do ask any questions that you have.
My daughter (11) has a t-slim and we self fund a dexcom so that they can talk to each other. The advantage is that it will cut out the basal if it senses a drop and help avoid hypos (it doesn’t always stop them but you get fewer). Management has been very good for us although it was pretty good in injections too. The big advantage for us with the dexcom is we can see her data on our phones so can help manage things from afar. For us there have been some issues with her finding it overwhelming having the pump attached all the time but that coincided with big puberty changes too. All the options you have a good. It just depends what your priorities are with integrating things like a CGM or going for no tubing etc. Here we had a session where you could have a play with each type of pump and see how they feel in your hands and how easy the interface is. There was a lot of support from the team in choosing and setting up the pump etc although with corona restrictions only one of us could go to the training and I haven’t really caught up on changing stuff on the pump so have to get my husband to do it but it won’t be long before daughter is doing it herself anyway. She does all the day to day stuff with it.