Which is the best Universal Audio interface for a portable setup.

The Arrow is a perfect portable solution for Thunderbolt 3 compatible computers, it is also the smallest of all of the Universal Audio interfaces. Those looking for a USB or Thunderbolt 2 interface would be looking for an Apollo Twin interface, these also have the option of including more Core processors, which are great when using the interface for mixing and other parts of your production.

What kind of plugins does Universal Audio make?

UA excel at accurately replicating iconic pieces of equipment, this can be standard studio components like channel strips (from studio mixing desks), compressors, equalisers, reverbs and tape machines, and useful studio tools like guitar amp emulation, harmonisers and other modulation effects.

Thunderbolt is a computer interface port similar to USB, only much faster. Thunderbolt is available in two popular formats: Thunderbolt 2 is a common feature on older Apple computers and is also available on some desktop Windows computers, and Thunderbolt 3, which is the standard port on new Apple computers and uses a smaller sized port compared to the previous generation. Thunderbolt 3 may look identical to USB-C, but you can only use Thunderbolt 3 with compatible ports, you can spot a Thunderbolt 3 port by it having a little lightening bolt printed above the port.