i have both in heavy barrel. (i think thats the only way a .204 is offerd)
anyway........
the 204 is very accurate. it took alot of load developing to get it that way with a 40gr nosler bt
@200 yrds..
the 223 is scary accurate out to 200yrds. the first load i picked from the nosler manual
for the 60grain partition is it....no further searching !!!!!!!!!
its hard to make a decision when the time comes for the kiyote, coydawgs or what ever.
but if i were a bet'n man i'd lean ta'wards the .223, cus its never wrong on how it performs.
i have it placed about 1" high on poi, and thats what i like, and it does too
keep in mind there are other thangs that makes them perform well also..........
both are great shooters.
its up to you... good luck!!!