Hello!

So I'm about to get a 2016 Kilo TT Pro and like most bikes on bikesdirect they only have a Fixed gear on. No freewheels. This is my first bike and I have no prior experience. I'd like to have the option to switch between the both. Anyways my question is which Freewheel cog would be the best? Most places don't have that many reviews and was wondering if any of you have freewheels that could give some feedback.

I was looking at this one
Shimano Single-Speed Freewheels

Also if it makes any difference here is the kilo I am getting
Save Up to 60% Off Mercier Fixie Singlespeed Track Bikes - Kilo TT PRO

Any info would be greatly appreciated.