NJ zone 6-7

we've had this arby for IDK maybe 30 years. It was cut maybe 18 years ago down to only like 2 feet and bounced back healthy (shouldn't do that I know but it wasn't me).

I like this arby because unlike emerald greens which only grow maybe 6 inches a year and are narrow. I like this is wider and grows maybe a bit faster than that, maybe 1' a year? And it's smaller than a towering Green Giant arby not suitable for certain locations.

I also care a lot about lifespan of shrubs, if this one lives maybe 40 years before it starts to die, I'd rather go with something more long-lived but these aren't too much of a hassle to uproot and plant something else if I do decide to plant these elsewhere.

I prune these at least every year, So I'm guessing that's the reason mine is so much denser than all the others? Again, I'm guessing these are even the same species and assuming no one every prunes theirs? This one row that looks really thinned out I do doubt are ever pruned but all I've seen in similar trees at other houses look sorta thin as if no one ever trims them?

If I leave it to grow tall, IDK how tall it'd get, in case that helps with ID, and I like it seems to grow taller than a emerald green. These 2 are about 12 feet now. I trimmed one to show before and afters if that helps.

ALL THE PICS WITH THE *RED BAR* ON BOTTOM ARE MY TREES, All the other pics are examples I've seen elsewhere to compare. I can get many more examples but they all basically look like the others, thinner and possibly not routinely trimmed, but I sort of doubt no one ever trims theirs.