There may not be a measurable accuracy advantage between the two for most shooters and applications but reloading is all about getting a whole lot of things, some important, so less so, consistantly right. Additive.
I'm firmly in the hand priming tool camp although I've recently lashed out for a very good bench primer. Will post a pic. Started out with a 310 tool and now use a 21st Century tool.
Had an opportunity to measure primer depths on a mate's reloads. He press primes and swears he has excellent feel. I measured several of his primers at an unbelievable 15 thou crushed.
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