Last year I only had the XOP Hand Climber so that was what I carried. The nice thing is that gave me a lot of flexibility. If for some reason, I didn't like one of my presets when I get out there, I could flex to a different area and use the XOP hand climber.
This year, I've added a XOP seat with Ernie's kit and I just found an old LW seat, so I'll be building that one up. Which will change my SRT platform to one of the post styles....I think without using them much, I'm not all that sure which one I'll use. I'm also probably loaning one to @rheusmc13(my brother).