It's going to depend on the type of track you're on, but those two tires are very similar and I'm sure that you wont notice any difference, but if I had to, I would choose the scorpions. The looser lugs will give you a tad more grip on looser, more dry dirt, or so I would think, and I would have that over a denser lug.
1983 212x "Mickey Dunlap" Powroll TT Trike -Blue frame, Supertrapp (looking for a Powroll DD), WEB Stage II cam, Powroll 6mm stroker, Wiseco 10.25:1 piston stock bore, ported, polished, +2 Swinger,White low-pros and 250R front fender, BAPP rear shock, Powroll Decals, NOS Carlisle R/A's
Gone:
'83 185s, '86 200x, '70's Full Suspension Hi-Performance ATC RD400,