Personality: There Personality are Similar trying to make everybody happy
Design: Pinkie Pie is has a Good Design with her pinks and with her main and her cutie mark suits her perfectly as for Unikitty I find it cute with her shades of pink her little horn to represent her name and having red blushing cheecks.
Development I had to give it to Pinkie cause Pinkie has gone threw a long way. As for Unikitty she still in development(Which ill update this in the near future)
Entertainment: They are both enjoyable and very fun/funny
By a cotton candy hair Pinkie Pie is the winner
Meme belongs to Stocking-Star
Blank meme here:Character Vs Meme