HI
To share out my experience , let me tell u first I was in a fix whether to go for pulsar or for unicorn but then I decided that let my dad take up the decision so I showed up both the bikes to him and trust me that was the best option I ever took.
To begin up with test drive both the bikes and I would say that the difference is in the smoothness .
Though pulsar may have better looks but even power wise its much more powerful than a pulsar with 13.5 bhp and the engine is utterly noiseless as latest norms.
Also I recommend that you test drive both the bikes atleast a kilometer or so and
you will find that gear shifting and braking is much more better of that of unicorn
Mileage
I am getting a steady mileage of 50-52 in saki naka traffic conditions but I drive between 50-70 kmph speed . But if hit at 100-110 kmph ( the bike is quite steady upto that ) then you get around 45-47 kmpl.
The cons is the horn its very feeble but I have heard that now they have improved on that thing .
People do complain about service center guys but upto now they are good with me
Given a choice between pulsar and unicorn go for the later rest is upto you just sporty looks or the wings