The Scarlett series of audio interfaces from Focusrite is arguably the industry leader. There are differences between each model that you want to familiarize yourself with, including the Solo and 2i2. The primary difference between
Focusrite Scarlett 4th Gen audio interface reviews: Which Scarlett
Focusrite Scarlett 4th Gen Review - EVERYTHING you need to know
Everything you need to make and record music. The Focusrite Focusrite Scarlett 2i2 Studio 3rd Gen is comprised of third-generation versions of the Scarlett 2i2 CM25 condenser microphone and the HP60 closed-back headphones. The Scarlett 2i2 3rd Gen Audio Interface is one of the most affordable yet great-sounding interfaces on the market. The interface includes class-leading 24-bit/192kHz AD-DA converters delivering pristine sound quality.
Focusrite Scarlett 2i2 USB Audio Interface
2-in/2-out USB-C Audio Interface with 1 Mic Preamp, Dynamic Gain Halos, Easy Start, and Hitmaker Expansion Bundle
Focusrite Scarlett Solo 4th Gen USB Audio Interface
Introducing the new Scarlett Solo, 2i2, and 4i4. - Focusrite
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Focusrite Scarlett Solo 4th Gen 2x2 Audio Interface Recording Kit with Exclusive Creative Music Production Software Pack with CR3-X Creative
Focusrite Scarlett Solo Studio 4th Gen Recording Bundle
Focusrite Scarlett 2i2 Studio 3G Interface Recording Pack