The definitive checklist which you should be using is the one in the aircraft's POH.
Of course, refering to the POH every time you fly the aircraft is inconvenient, which is why your school, and Transair, and lots of other people produce, sell, distribute, etc their own versions.
My suggestion would be to use whatever you find most convenient. But before you use it, compare it with the POH checklist, and use a marker to add anything in the POH checklist which is missing from the one you've bought and which you would most likely forget if you didn't add it. Also add anything else that you think is relevant (I haven't yet found a POH that includes turning your mobile phone off as part of the pre-flight, but I still find it handy to add it to my own checklists, for example). A checklist is a constantly-evolving thing which gets added to each time you discover something new which is worth checking.
FFF
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