Hmm, in terms of VCE subjects, I liked VCE Physics the most, followed by VCE Chemistry and then VCE Biology. This was due to having a really awesome Physics teacher though, so I think it's perfectly fine to dislike VCE Physics for its curriculum.
At Uni, I've done all three subjects again (but in differing amounts this time). I found Uni Chemistry the most enjoyable of my first-year units, followed by Uni Physics and then Uni Biology. However, I can say that the Physiology units I took (which are a subset of Biology) have really been up there in terms of enjoyment. So I guess Uni gives you the chance to look at more specific areas of these broad "sciences", and allow you to engage with the bits you enjoy! I've just finished reading my unit guide for Physical Chemistry, and I'm really looking forward to it.
Now, I'd say that the key trait amongst all of science is always being curious, and following your curiosity, seeing where it takes you, and what you can learn in the process. As you can probably tell, I really enjoy science, the idea of science, and the possibilities of science. To me, it's really amazing that because of the curiosity, determination, logic and creativity of some of the 'past greats', we can enjoy such a high standard of living and technology today. Every time I watch a documentary on a discovery, I want to stand up and applaud. To approach life with a mentality of always learning, always striving to understand the world around us is admirable to me. At this point, you may think I'm utterly mad, but that's just why I'm attracted to science, and I hope for some of you, this is what attracts you to science too

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To get back on topic though, in "real life", I have to say that I like Physics the most, followed by Chemistry and then Biology. Why? Firstly because I also really like maths, and Physics seems to involve a lot of cool maths, even if it's utterly mind-crushing at times. Secondly, I find that the questions in Physics are the "big questions", more "universal" than those found in Chemistry and Physics. Physics to me, encompasses everything in scale from the absolute quantum to the scale of the universe (or universes!) themselves. How did everything begin? How will it all end, if it does? What keeps things going? What explains the most basic of all phenomena in the world? Why is the Sun so bright? Why is the sky blue? What is sound? What is light? Why don't people on the opposite side of the Earth fall off? How does spinning a cricket ball cause it to turn when it hits the pitch? How can an object that is overall heavier than air fly? Questions such as these, which I'm sure we've all asked as a child, are what attracts me to physics, just as similar questions in Chemistry and Biology (and Psychology, Geology, Sociology, and even Economics etc.) are what attract me to them.
To summarise, I guess the "universality" of Physics is why I shall always love it as a discipline over the other sciences. I really like "universal" concepts (which probably also explains why I really like Maths as well), so my favourite topics in Biology are probably genetics and evolution, which apply to practically every single cell and group of organisms that exist. Likewise, in Chemistry, I love the study of atomic orbitals, the kinetics, thermodynamics and equilibria that exist in every reaction, stereochemistry, stimulated emission, and things like that. As you can see, most of these are physical chemistry topics, which probably explains why I like them.
But yeah, I guess that's just my (usual convoluted) way of expressing how I feel about sciences in general.