I'm bias and loving my 800gs
If you are truly overlanding the bike an extensive dealer network is key. If and when shit really hits the fan with any modern bike your not getting it fixed in a cardboard shack. For around home clearly this isn't a consideration. From my own experience the 800gs has been flawless but I also really maintain it. At first I thought I was going to love the Triumph but then I through my leg over one. The ergo's just don't seem right and maybe its just in my head but it seams a lot more top heavy. Lastly three cylinders has to cost more to maintain in the long run but only time will tell.