That's the trouble.
If the Maxx didn't have issues with the notification sound would you go back to it?
If the Maxx did not have issues with the notification sound I probably would not have left it. With that said, I don't know how long I would have liked the phone. I liked the active notifications, but the Maxx is a stock android phone, kind of like the google nexus phone. It does not have any extra's that Samsung and LG put on their phones. Some people like that, it is easier on battery sometimes, and maybe make the phone work better. The fact the maxx is as close to android stock is a selling point for some, for me it creates a blah phone, I like the bells and whistles. Its a personal choice.
Things I liked on the note 3, the pen is neat and useful, I don't use it every day, but there are times I use it. Multi window is a another reason I like the note 3, it comes in handy when messaging someone and you want to look something up at the same time for example. And of course the big screen is just awesome, and with the new feature of resizing the whole screen when needed is a good thing, I don't use it much, but there are times one handed is the way to go and this makes it easier. some of the other things the note 3, or basically the last few Samsung phones offer, such as smart screen, where videos pause when you look away, or the screen will scroll watching your eyes, those are a little gimmicky, and yes I know the spelling is off there, I turn those off as I don't use them much anyway and I feel it uses battery power for nothing.
I don't know what to tell you, my best bet is to go to store and look at it more. I don't know where you bought it, in store or online, but keep a eye on the 14 days as Verizon is very strict on that, and they start the 14 day countdown when phone ships which is BS. Good luck
I don't know how the 14 day rule works on when you exchange your phone, if the 14 days start over or not, find out. If they start over when you exchange the phone, something to consider is you can try the note 3, if you don't like it, return it and just go back to what you had prior to upgrading to Maxx for a week. Your account will reset back to eligible for upgrade and you will be able to get the maxx again later, but there is a $35 restock fee again, so this route could cost you $70 to try the note 3 out, so do your best to try to get the first restock fee waived, if not, call in later and see if you can get a credit on your bill for it.