Although I had to warm to both, I have loved playing MET and TWD since their rule sets have matured. Can't comment on the Pro versions specifically though.
I also LOVE playing Mustang and if I was looking for a great Stern game for general family use (no Metallica music/graphics or wife upsetting zombies) out of the three, I would go with this. A really FUN and often overlooked game!
If the choice was down to Met or TWD only, I'd personally probably go with MET (in a close decision) due to TWD's already mentioned frustrating drains and overall degree of difficulty.