Unless you shell out for a HP 9", you still have a very low pinion on the 9". A HP D60 puts the pinion way up in the air, has a larger ring gear and lots of options for gears and lockers, maybe not as much as a 9" but a lot. You could also put in a Gearworks 10" HP in the front but that is $$$. The housing is a lot thicker and tubes are thicker as well on stock 60 vs 9" stuff. Fabricated 9" housing cures that. Unless one is building a moon buggy, the extra weight I do not feel is a downfall due to where it is, down low.I think the 9" is the best way to go if you have the budget and or time to piece them together. View attachment 4025778
You can polish a turd but so much, and it is still a turd. Ask Justin @RustyNailJustin How much he has in his custom 9.5" LC axle with 80 outers and compare that to what it cost to build a locked 35 spline 60. I am sure it is not far off just in parts cost. I am sure Justin's axle is about as built and you can get using Toyota based parts.
With all the steering (Reid-Artec-PSC double ended ram with sweet valve, manual gear box, Branik-Willwood 14" 6 piston brakes, ARB, 5:38's, RCV 300M shafts, Drive slugs et) I am sure I am in the 10k range on my HP D60. But I never worry about it
A lot of this will come down to cost and what someone can spend. Like it has been said buy once, cry once. More food for thought.