Hi, welcome to cruising, we got hooked 26 years ago and still love voyaging.
We began by booking an inside cabin, fortunately a few days before we embarked they automatically upgraded us to a porthole. An honest brass port hole with the big brass jackscrew to boot. So we never have been in an inside cabin. We then cruised for the next seven years booking outside view cabins, usually big picture window ones. Then we booked our first balcony, if you are anything like we are, once you book a balcony you will never be satisfied without.
There is an old saying about cruising that I like to quote and I believe it to be very true. "There is no such thing as the best ship or the best cruise, the best ship and or cruise is the one best for you."
Below is a link to a guide regarding cabin selection, that might give you some ideas. When I browsed it I noticed one dated mistake. That is in #5 where it says Carnival and Norwegian Cruise Lines allow balcony smoking. That is not correct as both those lines discontinued balcony smoking over two years ago. The only one of the 12 global majors which still allows this is Holland America Lines which also allows cigar smoking as well as cigarettes.
Regarding inside cabins, there are pros and cons regarding them. One argument for, is the opinion "We are not going to be using are cabin except for sleeping as we are going to be out and about enjoying things." That argument has a lot of merit, particularly in your case where you only have 5 days on the eighth largest passenger ship in the world with all sorts of stuff to do, see, and eat.
On a longer cruise I would think twice as some of those inside cabins are really tight. Recently, another pertinent consideration occurred to me, if in the extremely rare chance I contacted something and had to be quarantined to my room, for instance legionnaires virus, the cruise lines insist you stay put in your cabin, they provide you meals etc., if you violate that they send you home. On our more recent cruises where we have had balconies that eventuality wouldn't bother me at all since we loved our cabins.
I really hope you appreciate the sea as much as I do. Enjoy your voyage.