Segmenting Software

I am considering purchasing some software to assist me in project planning. As far as I can tell, there are two choices. Segment Project Planner and Woodturner Pro. They seem very similar. I don't want to get them both necessarily. Is there any one, who has used both who can tell me the pros and cons of each, and which would be the best to purchase?
I have software from Kevin Neeley which will tell me segment length, board length etc. But I plan it on graph paper and use a ruler and a triangle. I know, pretty old school.
Thanks for your help.

RP