My personal experience is Historical, as I’ve had my horses at home for 18yrs.
Apologies, this is a Book 
1st barn I boarded was leased by my trainer at that time (who I bought my Hunter from). She made improvements to what had been an abandoned property & it was a workmanlike, not luxurious barn.
But her focus was getting known as a local BNT so Show Barn became her primary aim for boarders.
When my horse & I didn’t drink the Koolaid & show every weekend, we were exiled from the “elite” 12-stall barn to the larger general population. Fine with me, care was the same, same access to lessons when I wanted, trails off property & DH shareboarded a QH belonging to a non-showing boarder. We did attend some local shows - Regional & B - with pretty good results for my horse: Regional Reserve AA his 2nd year showing. We became friendly with some boarders, attended Barn parties hosted by trainer, socially active barn.
We lasted there 3yrs.
During which time trainer took to drink & coke in her climb to what she perceived as The Top.
Final straw was when - in return for work DH did for her including a phone system, PA system, locks & security system (all provided by his self-owned business) she promised to pay for the work by covering his fees at a show.
Then reneged at the show.
Causing us to move to Barn 2
#2 was a low-key boarding barn. Mixed group of WP, trailriders & a few like us: English riders, who did occasional shows & trails.
We grew very close to several boarders - some had also decamped from Barn #1.
DH shared board on another horse for a couple years, then we bought his horse.
We reconnected with a Dressage-focused trainer/friend who came monthly to give lessons to 3 or 4 of us. For these occasions we had potluck after lessons.
When he relocated to a nearby state, another trainer - used by a friend of one of our boarder friends, also Dressage - took over the monthly group.
But BM was a know-it-all 20-something. He was mentored by absentee BO who showed Cutting horses (arena had a mechanical calf) & care suffered. Poor quality feed, no water in (8h) turnout, clueless barn workers (one was feeding grain, ignored a horse lying down who did not get up for the grain… Yup, colic). These & other irritants had us follow Dressage guy to the nearby state & Barn #3
#3 was a brand new State of the Art facility. Built for the trainer by a client with more $$ than horse sense.
But he let trainer have a say in outfitting the barn. So we had a flyspray system, monitor for water consumed in each stall, lovely, roomy stalls w/auto-waterers, stalls picked several times a day, 20ac of trails right on property, a Cross Country course with obstacles from BN through Training, including a creek crossing. Olympic sized outdoor & indoor arenas with perfect footing. Upstairs viewing room with panoramic glass window to the indoor below was a guest suite with a complete kitchen, bedroom & bathroom with shower. Tackroom had laundry (done by staff) & a lovely bathroom on the ground floor.
But…
Insufficient turnout for the 16 horses meant 4h daily per horse.
Social life dictated by the BO, though we did have dinner off-site with trainer at least once a week.
Next But: board increased annually & included a weekly lesson (which neither I or DH wanted, we were fine with bi-weekly) until nearly my entire paycheck went to board. I was earning $40K at the time (late 90s).
So in Year 4 we moved to Barn #4
#4 was family-owned, mainly 4H (grandparents financed for grandkids). But as the English Outliers, DH & I were welcomed, made to feel like family. We even did some casual For Fun lessons O/F (DH built PVC standards, Dad BO helped) for some kids who were interested. And trails were a short ride down the road & through a neighbor’s field with permission. We even took some 4H kids who’d never been outside an arena on a trailride. Add 2 young gals who shareboarded our horses - one had shown Hunters as a Jr with me at Barn #1.
This lasted 2yrs, until a chunk of trails was bought by a Hunter who didn’t want us “scaring his deer” with our daylight rides.
And, I bought a 3yo OTTB in partnership with the gal I’d shown with.
As we planned to flip him, we began looking into a nearby place with a H/J trainer.
Moved to Barn #5.
I still see the daughter of #4 at Fair every year & we are friendly.
Barn #5 was not that social for us. BOs were a couple - she was sweet, he was an Asshat.
They had a RID stallion & 4 RID & Irish TB youngsters for sale. Neither one could handle the stud & nobody did anything with the sale horses.
And trainer had decamped before we moved.
My OTTB partner decided she wanted the horse & bought me out, moved him to a show barn.
Care was good & they had a small BN Xcountry course in a back field. Trails were a longish ride or a short haul to a state park.
Trainer from #2 came for monthly or so lessons for a while, then I connected with my current Dressage trainer (friend of BOs).
We were there 2yrs. Then I lost DH 
A gal I worked with (who had shown H/J in her native Turkey) started coming with me to ride.
She also rode one of the “sale” horses.
Bought my farmette & moved my TB & a new one home a year later.