benefits from fixed magnification Scope

Fixed magnification scopes are significantly sharper then variable magnification.

This is due to the fact that they don't have any glass inside that moves in order to zoom.

With fixed power lenses you can expect better quality glass and sharper image for the same price point.

+1 with Shutik !!! And while it's not always the case the field of view is often wider , and sharper from edge to edge . 
I will pick a fixed power EVRYTIME if it'll fit the purpose 

It has been my habit to use the highest magnification with my variable power scopes, 90 percent of the time. I think target shooting lends itself to the need for higher magnifications.
Just my two cents, your mileage may vary.

Endeavor - what are the highest magnifications on your scopes. I agree on on shooting at highest magnification possible, but only up to about 18x, but past that, the eye-box gets so small I can't see anything. When you say higher magnifications for target shooting, what would you call higher?

The reason I ask is that for me, anything past about 18x gets so hard to deal with that to me it is pretty useless. Just curious if you've got something I can learn about higher magnifications.

And, yes, Fixed magnification scopes are sharper. Only hesitation I have is that most have a fixed parallax at around 100 yards. On shorter ranges like 25 yards, this can leave 2/3 inch targeting error on a scope that is dead on at 100 yards. If you can get a scope that has parallax adjustment, and is fixed, probably sharpest combo you can get.

For the past 40 years or so I've owned only variable power scopes, mostly rimfire and centerfire. A month ago I bought a fixed 10 from SWFA (Demo A). Love it! It has PA down to 10 yards (or less).

I found with 3x9, 4x10, 4x12, etc. that I usually had the setting on 9 or higher. I'm primarily a plinker with squirrel hunting (not pesting) my objective. 

I'd probably like an 8X better than a 10 (greater field of view) but SWFA didn't have that. I almost bought a Weaver Classic 8 but didn't. The price is sure nice for that weaver though!

SWFA has 6x fixed power scope that I believe is ideal for hunting.

I like MOA quad reticle better.

Let me give a slightly different opinion to muddy the water. Years ago, when zoom lenses and variable magnification scopes were new, yes, the fixed magnification scopes were significantly sharper. The optical design was / is so much sharper on a fixed over a variable scope. Today, not so much.

​​The real sharpness difference is in the lower end optics. Buying quality optics rather than go cheap eliminates most of the sharpness differences. Good design will cost a bit more, and variable power scopes do use more glass so they tend to cost more than fixed. A high quality fixed will be less expensive than a high quality variable, but if you compare a high quality fixed to a high quality variable, you won't see much difference these days. Moderate range, same thing. When comparing, it's important to compare roughly equal quality (that doesn't always mean price) scopes.

​If you have a fixed price point, the fixed might be sharper at that point, but (there's always a but) how sharp do you need? Is that sharp enough to give up variable? That's your call.