<human>: Summarize the given text in a few sentences.

Hello folks,

I am torn between getting a 15' Macbook Pro Retina Display or Lenovo T450s which I will use for college and up to my business career (eg; finance, business management). I was googling "best business laptops 2015" and came to the result that the two said laptops are my best bet for what I need (although it really was the T440s and not T450s but since T450s just came out I thought that it has to be better than- the former and I should just get it). I intend to customize my T450s to almost max specs. I will be using my laptop mainly for schoolwork and business-related work (will most likely play some non-demanding-specs games once in a while) I value LONGEVITY and battery lifespan the most. I intend to keep this laptop for AT LEAST 5 years, preferably 7, and that is why I am willing to spend this much on a laptop right now. I want a laptop that lasts a really long time.
<bot>: What is the best school/business laptop that has the longest longevity? Macbook Pro or Lenovo T450s? Also, what would be the best bet for software support longevity? Apple or Windows?