I'd only consider opinions from people that have used several different brands of dots rather than accepting suggestions from those that only have one but "really like it!".
Never know, that $75 dot tucked away in a corner of the store may be the best for you.
I also chose a Vortex SPARC after researching them. I was willing to spend decent money but not to put a dopey red-dot sight on top of my AR that cost as much as the gun -- sorry. I was looking for quality, features and benefits to get the best bang for the buck and decided upon the SPARC. I looked at others and own others including tube and projection flat-screen types.
I like the SPARC. For me it is silly because without glasses all these red dots look like a fuzzy star in the sky you squint at at night.
I tried the burris fastfire II, the Primary Arms & the Bushnell TRS25.
Of the three, I liked the Bushnell best.
The Fastfire II is a fine optic but the price tag is almost $200.
The Primary Arms is $75 but the adjustment knobs are very stiff and the red dot is somewhat blurry.
It also seems to be a direct ripoff of the Bushnell TRS25 (made in China)
...I would have loved an Elcan but was looking at expensive Eotech's, Trijicons and Aimpoints plus a multiplier. Ultimately went with the Vortex SPARC and added a killFlash anti-reflective device.
I'm an iron sight man (LMT A2 sight behind it now). Two and a half bills was palatable and the scope is fine.
I have had a Bushnell TRS-25 for ~ a year now. It is solid, reliable and accurate. I have not had any issues with it staying zeroed. IIRC I paid $80 for it on "closeout" at cabela's.