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It's a personal preference. It you are going to do a SLC, have a plan what to do with the tips. Like beans. I prefer untrimmed spares, and that's how I smoke them.
I'll buy and smoke St. Louis style but if I paid for the whole thing I smoke the whole thing. Whatever you do with the trimmed ends is usually not as tasty as slow-smoked, on-the-bone, rib meat.
I too have recently jumped on the untrimmed spare rib side. A whole spare rib seems so much more tastier, and a lot more practical for the basic consumers (like me.)