@Toiinlove: I think the braids may work best. There's more versatility and your hair will be protected. It's important to feel beautiful and comfortable on your day. You shouldn't be worrying if your tracks are showing, etc. If you get the micros, you can still curl, straighten, pony, leave it down, whatever in terms of styling. Also, the braids don't need to be braided all the way down (i.e. tree braids).
However, if you're still "toying" (sorry couldn't resist!) with the idea of a sew-in, may I suggest the invisible part technique? Research the two options, talk with your stylist about both, and hopefully that'll narrow it down for you.
All the best!