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The relative difference between cogs gets smaller as they get larger so you want to have the shift be between bigger cogs if the gap is larger, all things considered. I'm not sure which would be better in your case, it depends on the shifting geometry of your bike and which gears you actually want to use. Either one, the shifting probably won't be great.
34 chainring 11-34 running 11 on 10 makes for a less than ideal range, every cog seems necessary. I'd get the 11s MTB 11-34 that fits 10s freehubs, or even just a regular 10s 11-34 - and road link.
I think 6800 SS is less likely to work with 34t cassette than R8000 SS but neither is a sure thing. Online seems to show more people having success than not, I had more failure IRL. When I did get it to work it was by reversing the b-screw but the biggest cog was always noisy and less confident.
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