D9G or D9H - What do you recommend?

I have 300+ acres I'm mining for gold. 8% of it is alluvial comprised of small rocks, sand, gravel and mud all cemented together. I need to rip it up and take it down 16'-20' to bedrock. This will be done layer by layer so I can check for mineralization. For this I need a 3-shank ripper. The property to the south has been trying to do this same process with a D6 and they are working the dozer to capacity. That is the reason I thought to step up to a D9.

The rest of the property is...

D9G or D9H - What do you recommend?

D9G or D9H - What do you recommend?