Your comment is stupid (no offence). I didn't say that I do better because I don't do the same as everyone else, just that that's what I like doing. I'd rather be in diamond experimenting and trying new strats, than in master just copying builds from the internet. Also, obviously there are dozens of different strategies, all of which can work perfectly well if you do them right. This is evidenced by the likes of TLO who always manages to find some way to innovate. I don't like doing the #1 common build, but that doesn't mean I have to do some obscure one that only I will ever try (eg 1 base ultra lol). My siege expand build is not at all unusual, loads of people do it, but still a small minority compared to the number that reactor hellion expand.
Low league? I'm diamond so I'm in the top 20% of players, since when is that low? If I invest 600 minerals in hellions (very early in the game), I expect to roast a few drones or lings otherwise it's not worth it. Denying creep spread and taking map control is very nice, but this can be done without doing a reactor hellion build. I like to get a few hellions after I've got a modest marine & tank ball, so I can send them out ahead to warn me if I need to siege my tanks up, clear lings from the watchtowers etc
Uh.. SC2 has a supply cap. C&C does not. I agree that SC2 is a deeper game, and it requires more commitment and a more "serious" approach. C&C is great for dipping into casually. Most players on that don't know build orders and don't worry about maximising mining efficiency, or what their APM is, they're just there to build some units and go blow some stuff up. SC2 is more like chess. You have to learn what strategies are good, and how to respond in certain situations, before you can hope to do well. Personally I love both series of games