If the 10W30 and 5W30 were formulated the same, both semi-synthetic, then yes the 10W30 would be my pick for lower Noack volatility and better shear stability.
BUT, I suspect they are not formulated the same, since Chevron make a point of saying the 5W20 & 5W30 are semi-synthetic only for these two grades, they don't say it for the other grades - so I assume the 10W30 is conventional. Saying an oil is SS has marketing value, so you say it if you can.
Given this, I would be happy with either, but probably pick the 5W30 SS. But as the poster above said, probably only minor differences. A PQIA analysis of both would be great.
BTW a 10W oil is good down to 0F / -20C (and maybe a bit lower). Once you are nicely above this temp, say at freezing, then with a positive displacement pump you will pump both oils (10W & 5W) much the same and both get to the top of the engine much the same.