Greetings, all!
In 3.5 and Pathfinder - prerequisites aside - which feat is better, Weapon Focus or Spell Focus? Both give a 5% boost to your primary means of offsense for the character. (I assume that for whichever character takes this feat, they do so for a weapon or spell school they plan to use often.)
I vote Spell Focus for the better. There are plenty of ways to boost accuracy. Spell Focus boosts all DCs of one spell school by one, but that +1 DC is often for area effects, DoT effects, crowd control effects, and 'if you fail your save I win' effects. Not all spells have saves, and not all spell schools are made equal for this feat (just like with Weapon Focus), but Spell Focus just makes me feel slightly better (compared to Weapon Focus) for having taken it.