Note against the Varadero
If you plan to use this off road there are two point to consider...
Firstly, you are likely to drop this heavy bike at some stage: we all do... However, the Varadero has its radiotors down the side of the bike, a la VFR800. All it takes is a fall onto a pointy stone or a branch pointing up and you may be stranded with a holed cooling system.
Secondly, the brakes on this bike are CBS: combined brake system first introduced on the blackbird, where a bit of rear applies a bit of front and vice versa. in a review of this bike versus another off-roader (may have been the R1150GS ADV IIRR) the tester felt this bike was frikkin' scary off-road due to this very characteristic (clearly visible in one of the photos as the guy's eyes had white all the way round on a downhill section!!): you want to choose your brake when off road, especially if trying to control a decent: do you want front brake going down a gravelly decent?
On-road its said to be a very good bike, as expected.
Between the two models you are choosing, the BM is more powerful, but spec sheets mean very little in the real world...Which ever bikes you are considering, I say get out there and Test ride them.. Twice, thrice, if needed. Its the only way to know what you like more: after all you'll be riding it despite what someone else's opinions say about one model or another....
Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)