Oh boy. OP, would urge you not to get sucked down the rabbit hole of Montgomery County people vs. Howard County people. The MoCo crowd is generally much more aggressive on this site but both crowds have their very obnoxious traits. Both areas, however, can be great places to raise a family.
Here is a somewhat recent write-up on Columbia in WaPo. I think in reflects some of the good and bad about the area (get through the first few paragraphs and you'll get to the rundown of the area's strengths):
https://www.washingtonpost.com/lifestyle/magazine/heres-a-suburban-experiment-cities-can-learn-from/2017/07/11/c737165e-4d1f-11e7-bc1b-fddbd8359dee_story.html
(You'll notice in the comments people from other planned communities in the area complain they aren't mentioned in the article as well, haha)
Bluntly, I don't think Olney specifically compares to most places in HoCo. I'll admit my own bias here, since we left the District for HoCo for a variety of reasons. I just have a hard time comparing the two areas in regard to amenities, etc.
I was (am?) very much a DC person and walked around for a week or two bemoaning my suburb fate pretty obnoxiously when we moved up here, but absolutely love living here. We're in Ellicott City, which is very close to Columbia but with its own, very distinct vibe that feels much more like a town. We are very close historic downtown and would highly recommend (safely) visiting the area as you make your decision. Ellicott City is closer to BWI than Columbia for the most part, so most DC commuters I know used either MARC or Amtrak passes to commute into the city pre-COVID. As a result, the commute is generally fine though can certainly be annoying. Some MARC-ers get on the train at St. Denis. The historic area continues to recover from the floods even during the pandemic and a new park is supposed to be installed downtown sometime soon.
https://www.washingtonpost.com/realestate/ellicott-city-history-hiking-and-a-place-for-families-between-baltimore-and-dc/2019/11/19/13cfb91e-0581-11ea-8292-c46ee8cb3dce_story.html
Good luck!