Q: What's the best way to move files from my 2012 iMac to my 2014 MBP?

What’s a good way to move files from my 2012 iMac to my MBP?

I prefer to do graphic work on my 21-inch iMac (2012 version). But when I travel I need to copy files to my 2014 MBP. I learned that my 2012 iMac is too old for use of AirDrop, so I’m copying and moving files with a flash drive. That seems slow and clumsy. Is there a better way?