JUN.

I have had both cams in old setups (JUN 3 & TODA spec B), and after extensive tuning with both, the JUN definately came out ahead, in terms of driveability, power output, and performance. My best experience was with all motor cams was with JUN stage 3 , as well I even had great results with CTR/ITR cams as well, although tuning is still the most important factor (as always).

Obviously, the answer to this question would depend on your intended purpose for your specific setup.
Toda's are primarily intended for road racing, having larger nonVtec lobe for more low end power, but often tend to lack in max hp.
If you are looking for a drag setup, you would definately be more inclined to look into the JUN's. Aside from being more driveable, considering the smaller nonVtec lobe, it also produces higher output because of the larger vtec lobe as well.
And if my memory serves me correct JUN now offers a stage 4 cam as well.

The only way any of this is going to make a difference in the end, is with a knowledgeable, experienced tuner, and plenty of tuning.