How to choose the right protractor for my effective tonearm length

Get Feickert, it was designed for ALL tonearms and all turntables and you can measure PS distance and choose one of 3 given alignment methods. So ONE protractor for all your turntables and tonearms/cartridges. 

You currently have 2 different and still don't know how to use them.  

Thank you for all the good info to all the responders. I will try out these protractors mentioned. Although the question I'm really trying to ask is how do I know that a protractor is right for my turntable other than the advice of anyone telling me use this protractor or that protractor. How does any given protractor achieve the correct over hang when not all turntable over hangs or tonearm lengths are the same.

I think you just don't understand how it works, so please read Dr.Feickert manual first. Read it yourself before asking others, it's very easy to understand the whole process as there are only 4 steps you have to do.  

Short tonearm or long tonearm, this turntable or that... , whatever cartridge you're using ... Feickert is universal for all of them (I owned about 10 turntables and too many different tonearms from 9 inch to 12 inch, all adjusted and aligned with Feickert protractor).