It really depends on the caster.
I have three PC's with caster levels.
The 11th level Wizard with a 10 Con held out for a Pseudodragon familiar. (He stays the hell away from melee.)
The 2nd level sorcerer hasn't bothered to get a familiar yet, but he will probably go for a Psuedodragon when he does.
The 11th level Ftr8/Wiz1/Def1/Dev1 went for a toad.
I have three PC's with caster levels.
The 11th level Wizard with a 10 Con held out for a Pseudodragon familiar. (He stays the hell away from melee.)
The 2nd level sorcerer hasn't bothered to get a familiar yet, but he will probably go for a Psuedodragon when he does.
The 11th level Ftr8/Wiz1/Def1/Dev1 went for a toad.