Mixed In Key Mashup vs Stanton Scratch DJ Academy Mix

Hey

I've been looking to purchase a program that allows me to mix on the fly on my laptop, mainly when Im on the go and just testing out songs, (not to do my entire mix/dirty work)

I've come across two programs that seem similar, yet different.

Mixed in Key Mashup
http://mashup.mixedinkey.com/

and

Stanton Scratch DJ Academy Mix
http://stantondj.com/mix-software.html

wondering if anyone had any hands on experience with them? I know theres a trial for Scratch but I haven't tried it yet.

Thanks for input.