The speeds involved with most hard drives do not warrant the money for any ThunderBolt cabling or adapters. The Apple thunderBolt-3 <-> ThunderBolt-2 adapter (US$50). The adapter does not supply POWER in either direction, so your drive must have a power source to use this adapter.
The drive you mentioned appears to be a Rotating Magnetic drive. These are surprisingly not limited by USB-2 cabling. At 480 M bits/sec, USB-2 cabling can carry just short of 50 M Bytes/sec, which is faster than almost every ordinary Rotating magnetic drive. any USB-3 cabling would be luxurious, and using thunderbolt connectivity would be extravagant (and never used near capacity).
For that enclosure and a MacBook Pro 2015, use a USB-3 Cable with blue insert, sold as a USB-3 cable SuperSpeed rated for 5 G bits/sec or 500 M Bytes/sec. If you need an adapter to USB-C be careful to get one that is rated for at least that, or a top spec one rated for 10 G bits/sec.

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