There is no best pump
There is the best pump.for you.
And the first criteria for you is that it is available from your clinic.
Some clinics may only offer one pump (due to the negotiations they have made with the pump manufacturers and the efficiency of training their staff in only one pump), some offer two or three and some offer more. There is little point setting your hear on one pump that is not available to you.
After that, I would watch a few YouTube videos about the pumps on offer and start a list of what is important to you.
It could be size it could be tubeless, it could be a phone app, it could be closed loop, ...
We are all different and our needs are different.