I've got a 2 year old pointer (Brittany) and 6 year old Field Golden. Lethal combination on upland birds of all varieties, with of course a few frustrations along the way.
They are my 2 favorite breeds and they excel in different situations, so I think I'll likely always have at least 1 of each. I would prefer 2 Britts and a Goldie long term for maximum scorched earth bird hunting. Allows the big runners to rest up on longer trips too.
The Britt can put in 30-40 mile days effortlessly and locates most of our birds. He's a smooth operator and very agile/stylish. The Golden is the dude that shows up with the battering ram and throws a flash bang grenade into the room blasting heavy metal lol. The Golden is the finest quail and thick rooster cover dog I'll likely ever have the pleasure to hunt over, and it's due to his combination of minimum required brain cells to function and a world class nose

He usually looks like someone took a razor blade to his face by the end of a hunt and simply doesn't care.
The ONLY issue we ran into was our Golden suddenly went hard mouthed at the tail end of last season and actually destroyed a couple birds, which was insane because he'll carry an egg in his mouth and not break it as a fun trick to show friends.
We realized it only happened when he thought our younger dog or a buddies dog was going to steal his bird...a little revisit of force fetch and having him watch other dogs get a retrieve before he was sent fixed that real quick.
You absolutely have to keep an eye on your flushing dog if you're going to run him in tandem with a pointer. I have my Golden sit when his collar beeps to allow myself to get into position without him busting the Britts birds. He occasionally busts a covey before I realize what's going on as he can read the pointers body language better than I can.
All in all I love em both to pieces and they each seem to turn in a couple "WOW" hunts every season where I'm convinced either breed is the best thing ever gifted to man.
Of course the best benefit of having multiple dogs is not to you at all, but to the dogs themselves. Having a buddy to hang with is healthy for them and the bonds they build with each other are priceless. Our Britt is legitimately co-dependent on our Golden and it's about the cutest thing ever.