Tell us you were open water certified under SSI without telling us you were open water certified through SSI.
In all seriousness, is weight or bulk the issue? I travel with a SS BP/STA, 18 lb wing, harness, and 2 cylinder straps. I'm guessing it is 10 lbs-ish total. With a 5 mil and Deep 6 Eddy fins, I am properly weighted, including being comfortably horizontal in the water.
Now I will shore dive in Maui more than I'll dive from boats, so it is nice that I don't need to rent weights when I go there. But that's just me.
Your decision comes down to your priorities for compactness, cost, weight, and convenience. My priorities could be completely different than yours.