Flared tip, straight tip, its all a variable on what you personally like. They both work equally as well, depending who is on the other end.
I have had several cheaper strikers that were bad, and after I did some sanding on them, they got worse and looked like those old 1st grade pencils, after I was done.
And once in a blue moon, I would make one better.
Now I leave it to the striker builder, and there are some good ones to choose from.
Experience dictates through trial and error, what works for you. Be it flared tip, straight or whatever.
It is no different than pot surfaces, and there are more and more to choose from all the different wood combinations, the list is endless.
Hence why the Pot Call and Striker Classified,is such a busy place. We all have different opinions, on what pot calls and strikers we like.