Which Bike Dilemma. (No Niche Content available)

Right then. I own a Kona Hei Hei supreme which is my race/marathon bike i also own a Orange P7 Single speed.
Im after a new bike for all day rides throwing about a bit and generally having a laugh on. I DO NOT want anything heavy. What would you choose between the Cannondale Rush 3 or the Trex EX 9.8 (Carbon and XT)?
The reason im choosing between those two is the massive discount i get for riding for the shop that sells em. Advice please

If it’s a choice of those two, then the Trek