Need new video editing media drive, USB C or Thunderbolt 2 with adapter?

[milton]

I am going to buy an 8tb hard drive for video editing in premiere on Windows 10. 
It will be my media / projects drive. 90% of the footage and projects will be 1080p

Any 4k footage will be proxy media.

I just purchased a new laptop, Dell xps 15 9560 with a thunderbolt 3 port. 

I am looking primarily at the GRaid 8tb thunderbolt 2 drive and the Glyph black box pro USB C drive. 
Which one will be better as my primary media drive? 
Do I go with thunderbolt 2 via an adapter (thunderbolt 3 > thunderbolt 2) or do I go with a USB C connection?
Given that Thunderbolt 2 is technically faster is that the way to go?

Or is there a different solution entirely that I'm not seeing?

I can't afford a thunderbolt 3 8tb set up so that is why I did not mention thunderbolt 3 drives specifically.
I only see the Akitio TB3 enclosure which is 399 and I would need to purchase my own drives on top of that. 

I am trying to keep the cost at $500-$600 USD. 

Any suggestions?

Thanks for the help!