I don't know about the competition but I have seen the tryhards totally demolish PS4 players but I think the opposition maybe blind. Also, I thought I read that if there is a party, the matchmaking will try and include a game with another party. That probably is the reason why you claim you see more competition on the PS4. More people on PS4 = more parties = more competition.
I tested this out a bit on both systems last night and I do believe the party thing is a very real deal. Playing solo, on both systems, I found much different lobbies. What I noticed, from the leader boards, is that on both systems, despite very different K/D ratios by system, I was put into lobbies with pretty much the same type of K/D's.
They were lobbies with a mix of people from .6 to 1.8 K/Ds. So that part did not actually change system to system. It was really the same.
But I did find that I ran into less parties on both. So I know that must be a very real thing that you mentioned up there.
But I also found, playing them both the same night, that I do believe I was right about hit detection and lag. I do feel like the game lags less, and the hit detection is better, and the game simply runs more smoothly on the Xbox 1. It just ran, and felt better, on there then it did on PS4 despite the lobbies being basically the same in terms of ability and such on each system.
I don't know if that's due to the Xbox version not needing to work as hard on the graphics, which aren't quite as good but are still pretty damn good, or what but it definitely feels like the game just runs better.
I also had another thing I want to test out going forward and wondering. Does it matter who the host of your party is? For example.
The other night I was playing with my buddy on Xbox one. When he was the host of our party we kept going into really bad lobbies, we were getting killed, and we couldn't do squat really.
We switched to me hosting the party and when I searched for the lobbies we immediately went into several games in a row in which everything worked great, and the two of use dominated the other team. Soundly for several games.
So does that really make a difference? I'm not sure. I need to test that out more on each system as well.