It all depends on how muscular. If they are bodybuilder-worthy level of muscle, I'm going with taller girl. If they are like the picture and what I would consider more so "fit" than muscular, I'll go with that. I'll pass on the fat girl choice.
That being said, it would a bit hard to find a girl who is taller than me. All the girls taller than me tend to be sports people: basketball players, volleyball players, and such. (I'm just under 6'4").
i dislike muscular guy honestly, he must be very active in sport, very popular with girls and usually they will try to keep his girl in the same league - eat healthy, jog everyday, stay fit. as a foodie girl, i don't think i can handle that (i love food, and i love a boyfriend who don't mind to eat my cooking to him, without judgmental in every calories in it)