While the Snow is indeed limited in parts/polyphony, I don't ever see a real-life issue with it. I run mostly live, most often with a single part, but sometimes multis. If you're playing multiple parts via the sequencer, then you might reach the limits more easily, but you can always freeze tracks to audio to work around this.
If you want to run multiple audio sources in and out of the computer at the same time, with the least latency, then the MOTU would be preferable. Remember, you don't need a multi channel audio interface just to physically hook up a bunch of things (guitar rig, bass, mic, etc.)... you can use a mixer then run that into the computer via the Snow's inputs. But a multi-channel interface will keep it simple, and support multi-track simultaneous i/o.
I'd try it first with just the Snow and pick up the MOTU down the line if you really need it. You can run both of them hooked up at the same time, but only activate the MOTU audio ins/outs and just the Snow USB/MIDI for TI control.
If you end up not needing serious multi-track capability, that's money saved... or money for other gear!
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Virus TI2 Desktop Whiteout • iPad Pro M1 • MacBook Pro M1
(Historically: Virus TI Polar, TI Snow, Virus "A", Ableton Live v3+, Mac since Apple ][)
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