Hi, I've got a 2015 Macbook Pro retina 15inch. I want to purchase an ssd external drive. I'm a photographer and I transfer files often between my external hard drive and Macbook Pro. Disclaimer that I'm totally new to Macbooks (switched from pc). I hoping to maximize transfer times between my external drive to my Macbook. With the terminology I'm not sure if I need to get an ssd external drive with thunderbolt or just an ssd drive without it. Is one faster than the other? Forgive my ignorance on this and thank you for any advice.