I think the TB would win. I rode a DS 250 last weekend and it was MAJORLY underpowered. The powerband on the TB is pretty snappy (for a 250 quad motor), but when you pin the throttle on the DS 250 all you hear is, "boooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooggg
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I think the DS 250 would be a fun little trail quad and would be more reliable in the long run because its a 4-stroke, but its definetely not a fast quad. Neither is the TB though...