LaCie teams with Seagate for new MacBook Pro compatible Thunderbolt 3 external drives
LaCie has teamed up with Seagate Technology to produce a new LaCie Rugged Thunderbolt USB-C drive and d2 storage solution, compatible with Apple's latest generation of Thunderbolt 3 MacBook Pros.

LaCie Rugged Thunderbolt USB-C
The drives, which are popular among photographers and videographers, aim to help create more efficient ways to manage large data quantities with "more speed, higher capacity and better compatibility."
The Rugged Thunderbolt drive combines an established design with USB-C connectivity and Seagate BarraCuda hard drives. It has mobile HDD capacity of up to 5 terabytes and will also be available in a 1-terabyte solid-state model that LaCie is touting as 30 percent faster than the previous generation at speeds of up to 510 megabytes per second. The company claims that users can transfer 100GB of content in roughly 3 minutes.
The units have a rugged build -- shock, dust and water resistant -- and will be available by the end of March in 2TB, 4TB and 5TB HDD and 500 GB and 1 TB SSD starting at $249.99.

LaCie d2
LaCie is also releasing the d2 Thunderbolt 3, a desktop drive that is designed to add up to 10 terabytes of additional storage to SDD limited laptops and all-in-one computers. Other specs include a Seagate 7200 RPM hard disk drive with speeds of up to 240MB/s. LaCie says thats a 10 percent improvement over the previous generation.
Dual Thunderbolt 3 ports allow users to daisy chain dual 4K displays, a single 5K display or up to six LaCie d2 drives. It's also possible to power the latest MacBOok Pro through its USB-C port.
The drive is coming in 6TN, 8TB and 10TB and start at $429.99. They're expected to ship this quarter.

LaCie Rugged Thunderbolt USB-C
The drives, which are popular among photographers and videographers, aim to help create more efficient ways to manage large data quantities with "more speed, higher capacity and better compatibility."
The Rugged Thunderbolt drive combines an established design with USB-C connectivity and Seagate BarraCuda hard drives. It has mobile HDD capacity of up to 5 terabytes and will also be available in a 1-terabyte solid-state model that LaCie is touting as 30 percent faster than the previous generation at speeds of up to 510 megabytes per second. The company claims that users can transfer 100GB of content in roughly 3 minutes.
The units have a rugged build -- shock, dust and water resistant -- and will be available by the end of March in 2TB, 4TB and 5TB HDD and 500 GB and 1 TB SSD starting at $249.99.

LaCie d2
LaCie is also releasing the d2 Thunderbolt 3, a desktop drive that is designed to add up to 10 terabytes of additional storage to SDD limited laptops and all-in-one computers. Other specs include a Seagate 7200 RPM hard disk drive with speeds of up to 240MB/s. LaCie says thats a 10 percent improvement over the previous generation.
Dual Thunderbolt 3 ports allow users to daisy chain dual 4K displays, a single 5K display or up to six LaCie d2 drives. It's also possible to power the latest MacBOok Pro through its USB-C port.
The drive is coming in 6TN, 8TB and 10TB and start at $429.99. They're expected to ship this quarter.

Comments
i thought they OWNED Seagate (or vice versa).
I've only used Lacie when they were a standalone company.
In general I would say HGST/G-Drive. Have a look at Backblaze's reliability stats. Admittedly those guys abuse drives sometimes - non NAS drives in custom NAS enclosures: https://www.backblaze.com/blog/hard-drive-reliability-stats-q1-2016/
The trick is HGST is now owned by Western Digital and some larger capacity (2.5" 5400 rpm mechanisms only iirc) use WD drives instead of HGST.
The main long-term weakness I have seen for LaCie has been the AC adapters for their RAIDs rather than the drives themselves.
Why would anybody want a peripheral that ISN'T USB-C*?
*) Thunderbolt excepted, obviously — but even that's the same connector.
Hence they all tend to come with slow HDD and a SATA connection mostly negating the benefit of thunderbolt over USB3.
I have only ever seen a driveless thunderbolt enclosure sold by de-lock. Don't bother, it's poorly built rubbish.
Better to get one of these laCies with the smallest HDD possible (for price reasons) and replace it with the SSD of your choice.
That is what I have done with my 2011 iMac, and now use the LaCie with a Samsung 850 SSD as my startup drive (2011 iMac does not have USB3, so worth the additional cost for a thunderbolt single drive).
if you have an older iMac on the other hand with only usb2 it is worth getting a thunderbolt single drive because it is much faster. Not these ones though as I think the connector isn't compatible with the imac's thunderbolt port.