Ranked in these QuestionsQuestion Ranking
Pro Multiple options as to the type of drive you want
You can get the Echo 15 with a DVD burner, Blu-Ray burner, or a Blu-Ray drive.
Pro Supports any modern hard drive
This dock uses an internal SATA connection so you can use a 3.5-inch drive or two 2.5-inch drives.
Pro Secures the Thunderbolt cable in
This dock offers the ThunderLok, which is a sleeve that fits over the Thunderbolt cable connector and secures it in place; making sure it does not fall out.
Con Produces some noise
The Echo 15 is probably the only Thunderbolt 2 dock that has an internal fan. Even though it's pretty quiet, it's still noisier than other options which have no fan at all.