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Message: <blockquote data-quote="Elric" data-source="post: 5112203" data-attributes="member: 1139">To answer my own question (slightly updated the phrasing)You should take +4 to all FRWs.  +1 AC negates half of the attacks that would otherwise hit you vs. AC, and +4 FRWs negates only a quarter of the attacks that would otherwise hit you vs FRWs.  However, this doesn't mean that you should pick +1 AC.  You need to go back to which blocks more absolute attacks (as I've assumed equal damage/status effects across AC vs. FRW attacks).Since many more attacks would hit you on FRW than AC (equal number of attacks directed against each, but the FRW attacks are more likely to hit), the absolute fraction of attacks blocked is much higher, 0.1, for FRWs, than the fraction of attacks blocked for AC, 0.025.As absolute attacks are what counts, you could get there directly by calculating 50% of attacks vs. FRW * 0.2 chance that each will miss b/c of +4 FRW= 0.1 fraction of attacks blocked.  50% of attacks vs. AC * 0.05 chance that each will miss b/c of +1 AC= 0.025 fraction of attacks blocked.An analysis that gets you +1 AC as the answer here is flawed.</blockquote>