I'm a brackets guy myself: I think they look the coolest and the most interesting and the different coloured elastics you can get on the brackets are cool to.
"Straight-wire"
(if that's the correct term for them) isn't really my style, but when I had real braces to fix my buck teeth I had removable straight-wire ones with a red retainer, I used to chew on them and break them quite a lot
but eventually they did what they were intended to do.
I don't like Invisible they're just boring in my opinion: I'm all about the metal baby