I'm looking at the following two options for a refurb 2015 MBP 15" (see pic below. Canadian prices). There's only ~$100 difference between them but the higher price has dedicated graphics and slightly faster processor. Which would you choose for longevity? I'm not a gamer or do anything really advanced. I have a 2014 13" now and it seems fine but I do miss the 15" screen. I know if I sell my 13" and get either of these I'd be down ~$1,000 given what my 13" may sell for and the cost of the 15". That's a big difference for me. Either way I know this 15" would run a 4K monitor better than my current 13" does now.