Since your feedback thus far has been split, I'll just ask all of you to choose one or the other..
You don't have to give a reason or explanation, or even have eaten at either place. Word of mouth or reading reviews will suffice in this poll.. Thanks!!
Top Vote getter by Sunday, 31 January, will be the place I make reservations for on our 9-day trip to Disney in 10 short days!! 
I've not heard the best word of mouth reviews for Mama Melrose, so I picked Prime Time.
I've never been to Mama Melrose, but I like 50's Prime Time. It's certainly not my favorite on property, but it's my go-to if I want table service at DHS.
Be good at something. It makes you valuable. Have something to bring to the table because that will make you more welcome. --Randy Pausch
Trip Reports:
December 2013: 10th Anniversary, 1st DVC Stay | April 2014: Birthday on the Boardwalk | May 2014: Star Wars Weekend, Navigating WDW with a wheelchair | August 2014: Villains Unleashed | September/October 2014: MNSSHP, F&W, Tower of Terror 10-miler | March/April 2015: Disneyland and California Coastal Cruise | November 2015: Wine & Dine Half, Food & Wine, 1st Disney Cruise | February 2016: Presidential Classic Gymnastics Meet | March 2016: "Work" Trip, Tours, F&G Festival | April 2016: Conference at Disneyland | Fall 2016: Festive Fall Fun | January 2017: Festival of the Arts | May 2017: AbD Backstage Magic | July 2017: AbD San Francisco | Sorry I had to give up doing trip reports. Too many time commitments right now.
We have eaten at Mama Melrose's a couple of times and enjoyed it. We've never eaten at 50's Prime Time Diner, so I based my vote on where we have eaten. I'm sure you can't go wrong with either. 
50's is a must do for us. It's the best sit down in DHS of course having Dad's Lounge doesn't hurt either
Member of the 6 castle club and working to pay for my next Disney vacations: 1/5-10/18, September 2018 for my 50th and 2018 the year of Disney cruising.
Voted for 50's because we have eaten there
I have eaten at both and hands down we love Mama Melrose's. Great food and service.
Mama Melrose's is awesome in my opinion. We did the Fantasmic special dinning there and it was great! Our waiter was awesome and the food was delicious. My mom said he steak was the best one she had the whole trip! And we had great seats for Fantasmic, I think we are going to do this again when we go in September. I happened to be SUPER sick the night we ate there and I still ate everything, I had an appetizer or Bruschetta and then I had a wild mushroom flat bread it was all really good and didn't want to stop eating it, but my stomach was so... upset! Looking forward to eating there again, when I am not sick!
I have personally never eaten at 50's Prime Time, but I haven't always heard the best things, its kind of mix review I guess.
