I think that under the current deal each club is guaranteed to be on the tv a set number of times, so two less popular teams will often be shown on telly at once as it uses up two of their total matches (one for each club) rather than have them both on individually.
As for choosing the most entertaining games for tv rather than the biggest – get real! Never going to happen and you could hardly pick them in advance.
There is no one TV company who would pass over Liverpool v Utd. Sorry, but despite Utd stinking out Anfield for 20 years now there is no chance of Liverpool v Utd not being chosen.
City v Stoke had the most goals, but was so one sided you would be hard pushed (City fans apart) to say it was good to watch, especially as one of the selling points of the PL is it’s ‘competitiveness’.