First off welcome to AA! Glad you found us here.
Well all of us on the Salty side will tell you to go Salt! A reef tank full of corals and fish is in my opinion the coolest looking tank you can have. Some will argue for a planted tank, but it's a personal choice.
Well the good news is that you have a 130g tank. Larger tanks are much much easier to care for than smaller ones. You're going to find it easier to take care of with the extra volume. Also, with that large of a tank, you'll also be able to keep some larger fish (Tangs etc) if you so choose.
It's really up to you. A reef is more expensive to keep (lighting costs mostly). If that's not something you want, you can always go fowlr
. A bit easier to do since you don't have to keep your nitrates quite so low.
Good luck and keep us informed on what you plan on doing!