My personal preference is for lead plated terminals crimped with a "proper" tool with stainless steel bolts combined with some kind of battery terminal treatment to prevent corrosion (most important with flooded batteries.
Allan is probably right. Flooded cells seem to be hell on battery interconnects.
That said, I've been very very happy with the solid copper interconnects I made for my sealed AGM cells:
A handfull. These are about half of one bank. (I have 72 cells in 3 banks)
One important consideration is to torque them up to the manufacturers specifications.
I've had no problems of bad connections or things heating up at all.
The first two banks in place and running.