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Those Natives were able to build pyramids that were larger than those in Egypt and walls with tighter spacing than any thing in Europe at the time. All without "sophisticated" tools. Metal can be easily worked with stone. That's why you sharpen a knife on a "stone".

one must take in to consideration the job the blade is intended for.  if you are going to be hacking through a tree or soing something else, a steel knife will work better because of it's duratbility, though you may have to sharpen it a few times.  if you are going to perform precision eye surgery, you might reach for an absidian blade, as they are up to about 500 times sharper than a steel scalpel, having an edge only a few microns across when made properly, an obsidian blade is better for this because of it's superior edge, you will not have to sharpen it if you do not abuse it.

everything needs to be put in context.  you can not put out such a blanket statement like steel is better than obsidian, though for most of our purposes here on the site, it is.  it is comparable to saying the bow is better than the sling, just because you can fire it faster, or something like that.

I would say they are.
More flimsy though, more delicate.

It would be a lot harder to chop down a tree with a flint axe than a steel one for sure...but it would still be pretty sharp!

Techniques for stone tools, and the tools themselves, varied, and vary, a lot from area to area.  In Irian Jaya, native guys just hack away at the big tropical trees using stone heads on long flexible axe hafts - but in other - particularly temperate - areas, such as in America or prehistoric Europe, trees might be completely cut down using fire.
  In any case: for ease of use, I personally favour steel knives for carving, because they are a lot quicker.  However, in Micronesia, the first Europeans in the area tried to trade their iron and steel axes for island produce, but when the Micronesians tried out their new axes for making a canoe, they found that the steel cut too deep and they couldn't control it like they could a shell adze.  So it is not possible to generalise about tools - it is all subjective.