Oh, and to answer the topical question, I generally pick aberrations or (in 3.5e) undead.
Generaly, the most optimal choice is the creature type that "trumps" other creature types, meaning that when a monster designer is in a quandry about what creature type to assign, he has the safety of knowing that certain creature types precede others. Giant is trumped by aberration, which is in turn trumped by undead. This is laid out in the MM's section on templates, but it applies to general monster design as well. Undead and outsiders at the top of the hierarchy; technically, you should never see an undead monster that actually has another creature type, but you could very well see a giant that has the undead type (e.g. a bodak ettin).
Now, outsiders should be a primo choice, but those clever balance-preserving designers rigged it so you'd have to pick a specific subtype, rendering it less optimal. But they didn't break undead up into subtypes (even though that's clearly warranted, as a zombie is markedly different from a vampire, which in turn has few traits in common with a banshee). So if you're just going for sheer commonality, cashing in on a favored enemy bonus as often as possible, undead are probably the pony to bet on IMO.
Generaly, the most optimal choice is the creature type that "trumps" other creature types, meaning that when a monster designer is in a quandry about what creature type to assign, he has the safety of knowing that certain creature types precede others. Giant is trumped by aberration, which is in turn trumped by undead. This is laid out in the MM's section on templates, but it applies to general monster design as well. Undead and outsiders at the top of the hierarchy; technically, you should never see an undead monster that actually has another creature type, but you could very well see a giant that has the undead type (e.g. a bodak ettin).
Now, outsiders should be a primo choice, but those clever balance-preserving designers rigged it so you'd have to pick a specific subtype, rendering it less optimal. But they didn't break undead up into subtypes (even though that's clearly warranted, as a zombie is markedly different from a vampire, which in turn has few traits in common with a banshee). So if you're just going for sheer commonality, cashing in on a favored enemy bonus as often as possible, undead are probably the pony to bet on IMO.
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