All of what Royce wrote, but I'd very much like to add the Swedish shoulderless razors as well.There are many features I've come to love and prefer in a straight. If I narrow it down to one it would be a proper thumb notch with proper jimps. The ergonomics and control makes the razor an extension of my hand. The aesthetics of the design draws the eye. CV Heljestrand MK thumb notches set the high water mark for me.
~Royce
..... I don't know why that seems important to some but it isn't important to me.
Finding the bevel angle is quite easy with a couple of measurements and solving a right triangle. A narrow/small angle can produce a sharper cutting edge, but the edge will be more fragile and dull more quickly. A wider angle will stand up to heavier beards and will be more durable over time and need less maintenance. You are correct to say "as long as your razor shaves well, it doesn't matter". Sometimes, even when you hone the bejeezes out of a blade it still won't shave well and many times the blade geometry (bevel angle) is the culprit. A good example is a "Gold Dollar", out of the box it has a very wide spine that makes it difficult to get a really keen edge on the hones. Sanding or grinding away some of that massive spine width makes them hone and shave well. Hope this helps.
Ronnie
Wouldn't a wide spine give you wide bevel instead of a narrow bevel? Maybe I just cant visualize it right now, getting late, going to bed.
Mike