Not saying either is better, just understand the part your concerned about being thrashed are prety hard to mess up... Provided the parts are not damaged (idler bushings excluded), I see no reason you'd not get the core exchange... If not, I cetainly wouldn't surrended them.
I sent in several of my spares as cores to SLR. I knew I wasnt going to get full core refund on some of the more beaten up ones, so I gave him my spares as well to help even it out.
He has a Jig that they put the stock Idler arms and pitman ars in. If they are bent, or tiwsted or anything, even a little you will not get full core charge back.
My SLR steering kit has worked perfectly for me for the past 2 years easily.
Actually now is the first time that I am changing the Idler arm bushings because there is a little play in it. I guess enough play for it to fail NY state safety inspection.
New SLR Bronze bushings were around $55 shipped and got them within a week or so. Now I just need to get them pressed in so steering will be good as new.
And to clarify, I did NOT do the required maintainence on the Idler arm. If I took better care of it, no doubt it would have lasted longer than the 2 years I had it..
Everything else is solid on the steering system on my truck.
Good luck..