As a bigger guy wheel quality and strength is going to be very important and if you have not ridden for 15 years your skills might be a little rusty and you won't be floating over those bumps as easily and might find yourself running in the lower gears as you build those legs into shape.

Technology has moved ahead pretty quickly and for someone who is looking at doing a lot of back country and trail riding a 29'r or hardtail mtb will be optimal while a road oriented hybrid will handle some pretty rough terrain but will really be better suited for the road.

The Crosstrail really leans toward the dirtier grittier side of riding and is more 29'r like and with some decent rubber underneath you you should be able to go just about anywhere.

If you can get a 100% return guarantee on the bike you cannot do much better than that.