Like others here , haven't compared the two brands side by side , yes other MH's but still different.
I put Bilsteins on my 2001 Gulfstream Conquest and it was night and day difference.
So when we got our 2005 FW 5000 I went with the Bilsteins again and later put a rear sway bar and again night and day difference !
Never have dealt with or used the Koni's so can't comment on them...
Not sure how long your Conquest is ? Ours was the sport and 23ft long.