I have a Scar 17 and love the platform for what it is...a lightweight , reliable 308 military style combat rifle that’s pretty accurate (easily 1moa at 100y with quality ammo all day long). I have had a 1-6x and 1-8x scope on it to plink steel out to 700 yards. It’s super fun to shoot, easy to clean/maintain (although I rarely clean it), and if I had to carry it around all day on a sling it would be more compact and lighter then an SR25. I got the $300 aftermarket trigger from Geisselle, the nicer forend extension that was another $200 and some other do-dads. That along with compliance work on the mags, compensator, and folding stock probably cost me over $700 from the stock rifle.
I dont have an SR25 but I do have a KAC SR15 with a match barrel. Excellent rifle all around. The top of the food chain when comparing Ar15 rifles. Nothing bad to say about it and would never sell it. I do have a JP LRP-07 which is like the SR25. Its big, and heavy, and should be properly maintained at regular intervals. It’s not something I could use in a CQB scenario because of its size and weight. It’s fun to shoot from a stable platform like the ground or resting on a solid barricade. And yes, super accurate. 1/2 MOA if I do my part with quality ammo all day.
If I had to choose between the two, I would pick the scar 17 over the 308 AR10ish platform. For me, I have a lot more fun shooting distance with my bolt rifles so that fills that requirement. I really could live without my JP rifle and thought many times of selling it. I have JP Ar15 rifles that I would be just as happy with in the 223 size. Still can get out at distance with the heavier bullets. The Scar is unique though. I have no other rifle in my collection like it. It’s low in maintenance with a real high fun factor. I bought one on a whim and was really happy from the first time I shot it. It never disappoints !