Do you know what size frame you'll need? You won't be comfortable (or fast) on an ill fitting bike.
Go to a bike shop and get some pointers on what size bike you need.
If possible test ride all three bikes to make sure you're comfortable on them and they fit.
__________________
The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.