Tire time...
Tried all of these in the same spot. Loose, dry sandy clay, damp clay, and rocks. These are all 1.9's. From worst to best...
Axial Maxxis Trepadors on RC4WD steel wheels
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These are pretty much s*** all around. They are smaller, narrower, and the hardest compound of all the tires I have. They are the stock tires that come with the SCX10. They don't do anything well except be round. They will also last forever.
Pro-Line BFG KO2 (soft compound) on SSD steel wheels
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These look the most "scale" and do okay on dry rock. They stiffen up pretty quick and then suck on everything if you get any sort of mud/clay in the tread. They have a wide foot print and do not clean out very well.
JConcepts Scorpios (Green compound) on SSD steel wheels
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These are awesome on dry rock. Best of any tire I've used. They do okay on the loose stuff because the tread is spaced further apart than the PL KO2 but you still have to hit it with some wheel speed. They load up quick and struggle in damp clay. They don't harden up like the PL when they get a little mud in the tread.
JConcepts Landmines (Green compound) on SSD steel wheels
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These are bonkers. They are good in everything. Clean out really well and can slow crawl over things the others would just spin on or have to hit with some wheel speed.