Leafs vs 3 link?

[Smallz72project]

I have a 72 GMC lwb with leaf spring suspension out back, and just purchased a 70 Chevy lwb with coils and factory three link suspension. I am basically combining the two into one. I dont plan on hauling much or towing anything too often or of extreme weight, which is the better chassis to use? Did any swb trucks come with the three link? I perfer the swb over the lwb and was thinking of shortening the frame, how would I go about keeping the three link if that is the way I choose to go? Any advice/pics are appreciated.