Im familiar with the unertl and Lyman STS scopes. 
I would like to hear comparisons with the Davis optical, the Fecker and Litscert scopes especially in the 20X range and how they stand up with Unertl and Lyman.

I recently acquired a Litschert 12 X, came with a rifle I'd liked for years.  Those cross-hairs are really dark & heavy.  Old time gun writers joked that Litschert used reject fence wire for cross-hairs.  But the optics seem OK, about like my Unertl & STS.  If I could hold a 12 X scope without shaking, it would be good for offhand.  If you go after varmints, it might be better that any of the others.

I've had a 6 X Fecker for years.  Not air tight, easily fogged up.  A pretty light scope, be OK for offhand if you left it in the sun for a couple of days before you used it.

Let me start with a qualifier. I’ve had two Lyman STS’s and four Unertl’s. Shot all of them atop 222’s, a Swift and a couple of 6 & 30 cal wildcats. But I’m not an optical expert by a long ways. I only know what worked for me. I am however able to pick people’s brains including one sniper instructor who I traded Star & Hollywood presses with and two Nam snipers. 

The Sniper crowd had shot lots of scopes but all said, empirically, that the Unertl scopes were just tougher.  That they could get banged around and still hold four corners three laps as they termed it. They never told me they were optically superior but for sniper use I just assumed they were acute-sharp. That's all I know

Rick

Thank you , all who responded. Guess I'll have to cough up the cost of a Unertl. They seem to be most prominent candidate for quality.

Unertl and Feckers: I don’t see a difference in the glass. The center focus on the Fecker sure makes that easier.

focus system?  Parallax adjustment? you mean the convienence?

When a scope is in perfect focus, ideally parallax is eliminated. At least that is my understanding. And with the Fecker that process is, yes, more convenient. One can check for parallax by looking thru the scope and moving your eye side to side, or up and down and observe if there is apparent movement of the reticle at the intended target. when movement is eliminated so is parallax. Whew!!

The thing to keep in mind with all these scopes is age. What was the best scope in its day, may be the worst one sitting on the table for the highest price. 

Stuck adjustments, foggy lenses, bent crosshairs, mounts with adjustments that won’t repeat……

I try not to get caught in manufacture as much as condition.