LQ4 Vs LQ9

What motor is the better one to go with? I know the LQ9 is like in a SS Silverado and the LQ4 you can find in 2500 seires trucks or even in vans!!!
I always here the LQ9 is better, but it goes for alot more then the LQ4! Whats the difference? I know the LQ4 is "like" the LS2 but its an IRON block and the ls2 is not iron block, has same or just about the same as the LS2! So which is the better route to go here... since an LS2 cost an arm and leg!!!

I currently have an 5.3l in my 99 GMC Ext Cab lowered 3/5 drop bell tech with 22's. All stock but the 77 series Intake from K&N. I was planning on putting an LS1 cam and a Wilson Fast 92mm Intake. but Seems that its better to go to the 6.0l. Any in put would help to know which way to go! Plus keep my 4L60E and build it that has 116k i hear its better to go this route because it has better gear ratios than the 80E. And should i re build my rear end so i dont have a one wheel wonder!!!

http://www.ls1truck.com/forums/lsx-t...0-lq4-lq9.html