For most of us, the professional alignment will be much more accurate. And, it takes an hour, as opposed to several hours if you try doing it yourself.
When I raced a Spec Miata, I painstakingly found as level a spot as possible in my garage, but still had to use floor tiles to shim the wheels where everything was truly level. Then I used my string alignment jigs and camber gauges and went to work. Eventually, I got good enough at it where it would only take me about 2 to 3 hours to do an alignment, but by that time, I'd probably spent around 10 to 15 hours getting good at it.
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