STUDIO XL vs SHUTTLE XL , which one to pick?

I’m talking about the thunderbolt 2 version, I need one of these drives soon. So i need to make a fast decision. Can someone help to point out what is the benefit of shuttle XL compared to studio XL other than the transportable capabilitiy ? Anyway my biggest concern is the R/W speed.
Which one is faster ? if this Studio XL is at the same speed as the shuttle , i may want to take the studio, because it’s cheaper. Please give me some advices.

Thanks
Andi

They are identical except for the handle and aesthetics.