If you're talking just intercooler to intercooler, I'd have to say the Spearco is better. The Turbo Motion is a modified stock 87 intercooler. But the TM kit will definately be faster than just the Spearco kit. It gets rid of a few problems. The turbo no longer has to suck air through the throttlebody, it blows through which will make more hp and give better throttle response. It comes with a great intake manifold which is a big restriction on a hotair car. I think the Spearco kit is better suited for a more stock car unless you do some modification to it.
I also believe the TM kit is available with the Spearco intercooler in place of the stocker but I'm not sure. I'm sure someone on here knows.