Store Bought Incubator vs Broody Hen

How many do you have coming?  Maybe you should split them. Give Ms Broody a few and hatch the rest.  Of course if it's your very first try with an incubator, I'd go for the broody.  IMO her instinct trumps your lack of practice.

Ditto.  My first hatch with the TSC still air incubator was a flop.  I learned what "counting your chickens before they hatch" meant.   Ignore the instructions and follow the info on this board instead.    With still air, you need to be just a little warmer if you are taking temparature readings on top of the eggs.   Also, humidity is a huge factor.    The water trays were not enough and I had to add damp sponges to get the humitity up.     

Recently I had a hen go broody sitting on four eggs.  I wish I had put more under her.  She hatched 100% and we have let her free range with her chicks.  They are four weeks old and doing great.    In the past when we incubated chicks and tried to integrate them into our flock, they were picked on terribly.  These chicks are protected by their mom and integration is going really well.

But my primary reason for using the broody is that nothing is cooler than watching mama hen lead her babies around and show them the ropes.  My entire family could watch them for hours.  It is truly an amazing thing.   IMO, that is the coolest thing I have seen since I have been raising chickens.

My friend gave me 18 Silkie eggs for my first incubator hatch. NOT ONE made it. But the 2nd time I tried my incubator I got about a 75% hatch rate.
If I were you I would give them to your broody hen. They do a much better job and you don't have to be worried about heat and humidity all the time.