OK, so there are a thousand different blade shapes, from straight to very curvy, thick and thin, and everything inbetween. What gives? How can I select a blade that is right for me, and what is the pro/con of each design? Or does it really matter in the end?

My JA Henckles is very straight with a slight curve on the end and it gives me a great shave. But suppose I find a cool looking razor at an antique shop, how do I determine if it will perform well enough? Or does the curve of the blade determine technique and not actual performance for a given facial curve?

It's a lot to ask, but inquiring minds want to know.....