The right pump is the right pump FOR YOU.
They are all good options so you need to consider what is important.
Do you want to be able to disconnect easily for example during exercise? In which case, a patch pump like Omnipod is not ideal although you can suspend the basal.
Do you want to carry around a separate controller? the Medtronic and t-slim are controlled through the pump but Omnipod needs a separate phone type remote control.
Are you offered HCL or will you need to self-fund? I believe they are all HCL-able but use different methods. I am not sure about the Omnipod but Medtroinc uses machine learning to work out your basal needs whereas t-slim requires you to program it and then it will suspend/give extra. If your basal needs are the same most days, either will work but if your exercise is irregular, for example, t-slim may be better. You may also want to look at the different CGMs they use as that could affect your choice.
Is size important? I am quite small and found all tubed pumps bulky and unable to hide them but for most people this does not matter.
It is also worth checking your TDD (total daily dose) and make sure they all hold at least 3 days' of insulin for you . with a bit to spare in case you have a carb splurge or are unwell.
If you are insulin sensitive, it is also worth looking at the minimum doses they offer as they may differ.
There are probably more things to consider but this is off the top of my head.
I recommend looking at the specs and videos and comparing them.