Just to toss in my 2 cents...
I did not have a Maxx but I did decide to go with the Droid Turbo 2 in mid December. I will say I did a LOT of research and ruled out at the time the following phones:
1) Samsung S6 - battery life is pathetic, barely lasts a work day if that
2) Moto Pure - Seemed to big
3) Nexus 6P - this is supposedly the hot phone out there, but is huge and I didn't love the look
Overall for me the Droid Turbo 2 was the best match for my wants and needs. After about 2 months I will say I LOVE the phone. I have not run into one issue or problem. I love the wireless charging, love the quick charging, Micro SD card option is nice.
you will not get 48 hours out of the battery, but I think you should be able to get through a whole day (6/7am - 10pm). If you have a chance sometime during the day to plug in a quick charger for 15-30 minutes you should easily be ok.
Price wise, you should be able to get the phone for ~$334. $634 list price but you should get $100 upgrade credit and should be able to trade in old device for $200 credit. doesn't even need to be your Maxx, and working smartphone will work.
PS my wife has the Maxx 2 and loves it as well. But the Turbo 2 is a bit better phone between the two