Honestly, I'm not too sure. Since I only grow for personal headstash, I never pay too much attention to yields, lol. I know Bodhi always said that Snow Lotus adds "size, frost, and potency" to the crosses. I've also gathered that 88g13HP is supposed to be a heavy yielder. My *guess* would be that Chem Kesey would yield more, and would be more indica heavy. The Moontang likely has more of that sativa, uplifting side.
Hopefully others can chime in with how Snow Lotus vs 88G13HP crosses compare yield-wise.