A search here could bring up lots of good data, no expert but I'll give you my 2 cents.
Number one, either one is a much better choice than the 204R , just on a brass basis alone.
Two, I have both and there is no real performance difference that can be measured in the field. Few fps at best....20Tac=20Prac=204R.
Last, all of mine perform very well, not a huge fan of the shorter neck and shallow shoulder on the 20Prac, but mine shoots a ragged hole at 200yds. Hard to argue with that. 20Prac just entails a 223 S die with appropriate bushings for desired neck tension.
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"I used to wear barrels out fretting over a bunch of things that don't amount to a rats petutie."
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