Cannondale Synapse Ultegra di2 Disc 2015 vs. Ridley X-Trail C10 Disc 2016 vs. Cannondale Synapse Ult

JMargo2370

Hello, anyone out there have any advise over which bike would be better for bike riding in Lake Tahoe are? I don't do much gravel riding, but the roads here are horendous and there are the occasional obsticle to ride over (bumps, potholes, etc.) I also have a good climb right out my door, and like to do 30-50 mile rides, deffinately have it narrowed down to these 3 bikes, but still undecided if I even need the di2 electric gears. Overkill? And is a bike with wider tires more cushioning? (X-trail)
The bikes prices are as follows. Cannondale di2 $3000 Cannondale Ultegra $2500 Ridley X-trail $3300.

Thanks any advice would be great.